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General => Chatter => Topic started by: gateway2capecod on August 28, 2009, 07:20:14 PM

Title: Davis Vantage Pro2 ISS Battery Life
Post by: gateway2capecod on August 28, 2009, 07:20:14 PM
Hello...


was wondering if anyone one else with a Davis vantage pro2 can tell me about how long the battery for the ISS is expected to last? I have had the original battery now in place since June 2007 and That seems like a long time for it to have lasted. The one thing I dont want to have to do is replace it in the middle of this winter.

The ISS on the main Unit with rain bucket and temp and hmidty sensors wouldnt be too bad to replace, but the ISS unit for the Anenometer Transmitter is the one that is way up on the roof, so wouldnt be any joy in going up there on a cold, ice, snowy day.

One last question...where is the best place to order a replacement battery for this unit?..perhaps someone has a Link.


Thanks...Chris
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: CNYWeather on August 28, 2009, 07:56:33 PM
I was going to ask something like this too. I see my reception is
slipping the last few days. Havent moved anything and it's down to 89%
and was thinking battery maybe.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: Budgie on August 28, 2009, 08:44:55 PM
At THESE (http://www.batterystation.com/cr123a.htm) prices it would be daft to wait till they give out on you.  :wink:
(Note: This is not a recommendation of the company, they were just the first one's I found doing a Google. :wink:)
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on August 28, 2009, 09:15:10 PM
I would change it once a year if it needs it or not. How long it will last depends on how much sun you get and how open to the sun the panel is.

No need to order, they are very common batteries and you can get them at most stores that sell batteries, somewhere like Target will usually have a good price.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: Kojack on August 28, 2009, 09:23:51 PM
I would change it once a year if it needs it or not. How long it will last depends on how much sun you get and how open to the sun the panel is.

No need to order, they are very common batteries and you can get them at most stores that sell batteries, somewhere like Target will usually have a good price.

I go along with Niko.
With daylght hours getting rapidly less, I tend to do it at this time of year every year.
My additional sensors don't have solar panels and the cells only last about 10 months.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: aardvark on August 28, 2009, 10:48:21 PM
Davis, claims it will last 3 years, but really I would change it every year... pick a season...
I usually change mine twice a year.. but then I have a real good deal on CR123's from the Battery Station and I buy in bulk.   I have all those 6 extra sensors running and of those, they do use the battery more.

Niko is right.. do it annually.   One of the things anyone needs to plan ahead is where are you putting the ISS and is it easy to get to to do the replacing  and hence.. pick the season so if you have mounted it on a roof, is the weather such you can go up and come down gracefully.   
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: gateway2capecod on August 29, 2009, 07:05:09 PM
hello..

thanks for the links.....does anyone know what the original battery that ships with the vantage pro2 "mah" rating is?

and what brand that battery is?


...chris
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on August 29, 2009, 07:20:04 PM
I think most of the ones I have gotten from Davis have been Panasonic. They are non-rechargeable lithium batteries so I don't understand the mah question.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: zeppline on August 29, 2009, 08:44:09 PM
Panasonic CR123a, 1550 mah, 3.0V Lithium.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: gateway2capecod on August 29, 2009, 09:00:44 PM
will this one work....

http://www.batteryjunction.com/1pcencr3voph.html


rated for use in temperatures of -40 F to 140 F


...CHRIS
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on August 29, 2009, 09:24:14 PM
That's it.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: gateway2capecod on August 29, 2009, 10:28:57 PM
Thanks Niko...


I just ordered 2...total price was $3.00..The shipping is cheaper if you choose USPS First class, instead of leaving it at the default choice of "Ground". at least for my location it was...only $3.95 for shipping.

total was $6.95 for 2 batteries w/shiiping.

one is for the davis ISS and the other for the davis Anenometer transmitter ISS.

...Chris

Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on September 01, 2009, 10:01:33 PM
It's a good price, a lot cheaper than Safeway that's for sure  :lol: I also ordered 2 since mine are due for replacement. Be interesting to see what datecodes we get, although they have a very long shelf life so it's unlikely to be an issue.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: gateway2capecod on September 01, 2009, 11:03:36 PM
Hello niko...

Mine should be arriving in a few days now..perhaps even tommorrow. Ill let youknow what date code I get on them. When yours arrive, let me know what yours are.


after I purchased mine..the panasonic ones....I then found the Duracell "Ultra" one here...

http://www.batteryjunction.com/duraacell-cr123a.html

even though they are $1.70 each...Duracell is usually a good choice of Brand, either that or I have been brained washed into thinking Duracell is the best...lol

either way I dont think we can go too wrong at these prices. I may make it a routine to change mine every year in the Fall..


(I really dont know why either they show/have a MAH rating, since these batteries are not rechargeable.The solar panel on the ISS Doesnt charge these batteries, It charges a Capacitor in the the ISS Unit itself. The batteries are then used IF the capacitor runs out of juice. at least thats what I was reading on another website about all of this and how it works.)

...Chris
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: gateway2capecod on September 02, 2009, 05:16:28 PM
Hi Niko..

I received the batteries today. They were basically wrapped in bubble wrap and shipped in a bubble envelope with a receipt. Could not located any "datecodes" on the batteries themself's.


...chris
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on September 02, 2009, 05:30:55 PM
This is a panasonic, the code is subtle but it's there on this one:
(http://www.realweatherstation.com/FILES/issbatt.jpg)
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: gateway2capecod on September 02, 2009, 06:35:36 PM
Hi niko...

WOW...You were right...it is there. I needed a flashlight and Magnifying glass to see it, but found it on both batteries.

They both have the datecode of 6-2019.

Thanks...Chris
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on September 02, 2009, 06:45:18 PM
That's good  :D  Mine are on the way...
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: snowman on September 08, 2009, 09:38:42 PM
Thank you all for posting about the battery!

I have the classic Davis leaking capacitor going on, and didn't realize it until I chewed up 2 batteries in the past month.
For the last battery I got before finding out about the capacitor issue, I just grabbed one quickly at a hardware store, and paid $11.50!!!

I just placed my order for 2 of the 123's we need, and also stocked up on AA's and 9V's while I was there.

So, to replace my ISS SIM, plus 1 expensive battery, I am up to $83.50.......

Anyway, thanks for sharing the battery site!
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on September 09, 2009, 05:59:29 PM
Hi niko...

WOW...You were right...it is there. I needed a flashlight and Magnifying glass to see it, but found it on both batteries.

They both have the datecode of 6-2019.

Thanks...Chris

Got mine today, they are 03-2019's which is good. I'l install my spare (a 2015) and one of these new ones, and have a good fresh spare. Good deal, thanks for the tip  :D

P.S. I discovered there are rechargeables made in this size, but of course that's not what the ISS needs.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: stuartturrell on September 12, 2009, 07:50:23 PM
i have been using rechargable cr123's for around 9 months now.
I will never last as long as the normal batteries, but they work ok.
I haev always got one spare so as soon as i get the "station 1 low battery" message up, the spare is charged and later that day, i swap them over.

I do however have a leaking "supercap" in my ISS, and soil station. Remote anemometer is fine at the moment.
I am hoping using rechargeables hasn't caused the leaks :(
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on September 12, 2009, 08:50:37 PM
What voltage are those rechargeables? I see both 3.0 volt (same as the regular battery) and 3.6 volt available, the supercap might not like the 3.6 volt ones.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: stuartturrell on September 13, 2009, 09:55:38 AM
Checked this morning, the ISS had 3.7v rechargable battery and the anemomenter had a lithum 3.0v.
All my rechargable batteries are eitehr 3.6 or 3.7v, which is good for my torches, but not the stations.

Will keep them away in the future JUST in case
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: zeppline on September 13, 2009, 08:19:06 PM
Is is possible that is why the Supercap is leaking. They are rated at 2.7 volt, you are a full volt over that. I have look for higher voltage but they do not come in that size. Most are either 2.7 or 5.0 volts
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: gateway2capecod on September 13, 2009, 08:31:29 PM
Hello...

The Davis Vantage Pro2 requires a 3.0 volt Lithium Battery (Non Rechargeable).

The difference between Lithium and Lithium Ion is that the Lithium is NON Rechargeable,..and the Lithium Ion is rechargeable.

The solar panel on the Davis Unit ISS charges the Capacitor, not the battery...once the capacitor is out of juice...the battery is there for backup power. on most days the solar panel can charge the capacitor enough to make it through the entire night time hours, this is why the battery also last so long.

most likely, and I am guessing here..during the winter time when we get down to around 9 hours of daylight around X-mas time, is when the capacitor comes close to getting a good enough charge during the daytime to make it through the entire night.

I dont think it is a wise idea to place a 3.7 volt or any other volt.. than the recommended 3.0 volt that the Davis ISS Requires.

...Chris
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on September 13, 2009, 11:58:38 PM
The solar panel on the Davis Unit ISS charges the Capacitor, not the battery...once the capacitor is out of juice...the battery is there for backup power.

It's the same thing in the end but I think the ISS always runs off the supercap, and the battery charges it when the solar panel doesn't.
Title: Re: Davis Vantage Pro2 ISS Battery Life - Update
Post by: niko on March 05, 2010, 04:39:56 PM
Got mine today, they are 03-2019's which is good. I'l install my spare (a 2015) and one of these new ones, and have a good fresh spare. Good deal, thanks for the tip  :D

P.S. I discovered there are rechargeables made in this size, but of course that's not what the ISS needs.

I got the low battery message today, that 03-2019 battery was down to 2.832 volts, so that's only 6 months since it was installed. This VP2 ISS doesn't get much sun but even so I don't recall ever losing a battery that quickly before  :( 
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: ThorntonWeather on March 06, 2010, 01:23:51 PM
Like Chris, I haven’t touched my batteries in about the same amount of time so I reckon I too should join in and replace them.  Just need to be sure I know what I need…  I have the VP2+…
 
This takes two of the CR123’s?  Does the 24 hour fan take something different?
 
Also, I have a separate wireless transmitter for the anemometer.  Is that two CR123’s as well? 

Thanks!

   Tony
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: andro700 on March 06, 2010, 02:52:10 PM
The one for the wireless transmitter for the anemometer takes just one Tony.

Chuck
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: pinkpanther on March 06, 2010, 04:49:27 PM
Just changed a leaking super cap from a soil/temp. transmitter, after "eating" two batteries. Both batteries lasted for about 2 months each, I first suspected the solar panel since it lost the glossy look after 2 years of operation, but on a closer look I found the cap. I should have ordered more than one when I did but?......... sure a 3.6 V rechargeable puts a strain on the cap since the circuit is designed for 3.0V .
Peter

p.s. this is a leaking super cap
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on March 06, 2010, 11:17:52 PM
Uh oh, bad news, BatteryJunction has burned (http://www.wfsb.com/news/22589216/detail.html), no more cheap CR123's  :(
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: Stevec4 on March 07, 2010, 11:48:30 AM
I ordered some from them on the 5th of March and had no problem. So everything seems to be ok.

Steve
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on March 07, 2010, 02:58:55 PM
Interesting, I tried yesterday, and again after seeing your post, and get this notice:

Dear Customer,

At 3:30 AM on 2/17 there was a fire in our building that has forced us to temporarily suspend operations. As a result we are not accepting new orders at this time. We value your business and are working diligently to restore full service as quickly as possible. We do not yet have an estimate as to when we will be able to ship orders but we will be posting updates regularly to this space.

Thank you for your patience and understanding.

Sincerely,
BatteryJunction.com  
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on April 07, 2010, 08:00:13 PM
Good News, www.batteryjunction.com is now back in business  :D
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: gateway2capecod on April 08, 2010, 11:37:11 PM
hello niko....


just an update on the batteries I bought, around the same time you did from the junction. Mine are still both working.."knock on wood". I placed one in the Davis ISS unit and also the Davis Anenometer Transmitter kit unit.


...Chris
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: mth on April 09, 2010, 12:40:00 AM
i have been using rechargable cr123's for around 9 months now.
I will never last as long as the normal batteries, but they work ok.
I haev always got one spare so as soon as i get the "station 1 low battery" message up, the spare is charged and later that day, i swap them over.

I do however have a leaking "supercap" in my ISS, and soil station. Remote anemometer is fine at the moment.
I am hoping using rechargeables hasn't caused the leaks :(

Does the Davis VP really give a message to the console "station 1 low battery"??
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on April 09, 2010, 12:44:38 AM
Yes, it does.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: mth on April 09, 2010, 12:46:01 AM
Yes, it does.

Niko....where on the console so I can look out for this.  I can't find any mention in the console manual.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on April 09, 2010, 12:48:49 AM
Along the bottom of the screen, same place it does "raining cats and dogs".
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on April 09, 2010, 12:52:21 AM
There's a WD status tag too:

%vpissstatus%...............ISS battery status flag
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: meteofig on April 11, 2010, 02:09:41 PM
Hello all

I wonder if I could have a word of advice from this panel.

I have a VP2 working OK since Apr 2005 and normally I have replaced the ISS battery once a year.

Recently I have been experiencing a new situation. During the day the transmission to the console works flawlessly but when night arrives no more data until next morning... :-(

I am not electronic savy but it looks like a battery situation...

The problem is that I have now replaced the battery, 3 times, for fresh new ones and the problem is still there... #-o

I saw mentioned earlier in this thread a “leaking super cap”…. Could this be the culprit???
How (and where) can I check?

Any other idea / suggestion most welcomed

Thanks in advance

Rui
PORTUGAL
www.meteofig.com
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: aardvark on April 11, 2010, 02:48:36 PM
I had the problem last winter.  I first suspected that the battery was bad.. so I replaced it, then went in and reset the console to get rid of the message (just done and the down arrow or wait until midnight)  and we are fine.  I had thought maybe the solar panel was bad, as I also normally change the battery out.  But it works fine.

What Davis suggested is that if the sunlight isn't hitting the panel long enough, then the super cap doesn't charge and it uses the battery more.  We had not many bright days this last winter and I am guessing that is the problem.  Anyway,  I would take off the plastic cover over the ISS board and give it a look at the super cap with a magnifying glass to see if there is any corrosion or leaking.   I live inland so there isn't much unless you ask about road salt during the winter, and there is no spray so that wouldn't be it for me.

If it cap is good then I would think it is either a bad series of batteries, or the solar panel isn;t doing its thing, or that the sun angle isn't charging the cap.  IF it looks bad, then it is time to contact Davis to send you a new ISS board.  What I would try to do is get them to send you the replacement board and you return the bad  one to them.   They have on their web site a video on how to replace the board.   That alone tells me that you are not alone with these going bad.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on April 13, 2010, 08:52:58 PM
hello niko....


just an update on the batteries I bought, around the same time you did from the junction. Mine are still both working.."knock on wood". I placed one in the Davis ISS unit and also the Davis Anenometer Transmitter kit unit.


...Chris

The early demise of the one I installed is down to the classic leaky supercap  :roll:

(http://www.realweatherstation.com/FILES/164.jpg)

I called Davis but the bums wouldn't send me one  :( so I've had to order a couple.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on April 19, 2010, 08:13:52 PM
The early demise of the one I installed is down to the classic leaky supercap  :roll:

I called Davis but the bums wouldn't send me one  :( so I've had to order a couple.

Well, I just received my new leaking super cap, to replace my old leaking supercap  :onfire:

Looks like shipping damage, anyone who thinks you can safely mail these parts cross country in a very thinly padded envelope needs to think again  :roll:

Oh well, off to Mouser (http://www.mouser.com) which is where I should have ordered in the first place  :oops:
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: csonni on December 01, 2012, 12:25:33 PM
I just found my anemometer ISS flatline last night.  Pulled the battery.  Voltage was down to 2.5 volts.  Put in one with 2.7 volts and nothing has kicked in.  That's 2 gone in 2 years.  When replacing these in the Vantage Pro 2, is it good enough just to replace the battery or is there a way you're supposed to reset?
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: mcrossley on December 01, 2012, 01:11:44 PM
%vpissstatus%
Is it just me... :? :lol:
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: Budgie on December 01, 2012, 01:21:24 PM
I try to replace the battery during the day (super cap well charged) and just pull the old one out & fit the new.
Two batteries in 2 years ain't bad. On my main IIS I tend to change the battery around October as the shorter days are drawing in, just to be on the safe side through the winter. :wink:
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: aardvark on December 01, 2012, 01:46:58 PM
all you have to do is just replace the battery.  The console eventually resets itself at midnight, OR... you can put it into the setup mode, and take it back out and that will reset the console.

Flatline?  you mean all dashes on the console for direction.   I'd contact Davis.   I am betting they have their units not built in the US and some bad parts.  should last longer than that.     Sorry to hear that it is giving you headaches especially since we are both getting into the interesting weather time.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: Martyn on December 01, 2012, 03:33:38 PM
I never got any low battery warnings on the console but I think I changed the battery for the first time after 3 years as I thought it was well overdue lol. The current one has been in for over 2 years. I always use Duracell.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: csonni on December 01, 2012, 04:43:29 PM
By flatlining I mean on my WD window via the Davis Envoy.  As soon as the sun started warming up the ISS solar panel, data tarted streaming again.  I would assume this means a bad battery.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: aardvark on December 01, 2012, 06:17:50 PM
or a bad super cap
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: csonni on December 01, 2012, 06:37:20 PM
I installed a battery of a bit better voltage and, as I said, data started streaming.  I then removed it to have it replaced (3 year warranty) and data continued streaming from the solar panel.  I assume this points to a good Super Cap.  Stuck a fresh battery in there.  Seems like they're going for a year.
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: aardvark on December 25, 2012, 06:17:37 PM
I got a low ISS battery note last summer, so I put in a new battery and went on.  Earlier this month I came home and saw the outside sensors dashed out.  So I hoof out, take off the cover and flip the test switch up and no led light.  I put in a new battery and it flashes like mad.  So   put everything back and figured it was a bad super cap. I didn't have time to fiddle with replacing the cap so I ordered a new board from Archer Trading.  They sent the board, antenna and case, all I had to do is go out, take off the ISS, fish the cables in and out of the abnormally small  access area . I finished as the sun was setting, so I put back in the battery to run over night the next day, I went out and put in a fresh battery and we are done.   

When the weather gets better go out and take off the solar panel, and unscrew (phillips head) the four screws under the plastic dome that hides the components and look at the supercap to see if it is leaking or not. If it is, then you could order a new supercap and have it ready to replace when you have the chance.

 I am thinking that since Davis has a video on their support site on how to remove this unit and replace it, the death of the supercap is more prevalent than we suspect.   In the instructions on replacing it , the warning that  the leads must be bent away from the bottom of the  supercap case and that looking at the picture attached it isn't.  Then Davis recommends putting in a spacer between the replacement supercap and the circuit board to take a strain off the base, indicates to me that they have a quality control problem when the boards are made.

In any case, now I have two ISS boards, ordered the supercap from Archer Trading post, it has been shipped  and on their site they have the same recommendation to protect the supercap http://www.archertradingpost.com/atp/index.php?main_page=product_info&cPath=1_6_9&products_id=68 (http://www.archertradingpost.com/atp/index.php?main_page=product_info&cPath=1_6_9&products_id=68)
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: stevebrtx on December 25, 2012, 11:57:20 PM
I checked into my station at about 6:40am today to find the Number 2 station offline, needs battery, so I had a spare, thanks Santa, installed, corrected the dbase to fix the graphs and headed for Manzanillo, 86 and hazy? - but, I wanted to take pics, oh well. And, as I passed the volcano at Colima I couldn't even see it for the haze and clouds, not what I was expecting in my stocking, thanks Santa?
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: aardvark on December 31, 2012, 06:00:39 PM
Is it just me... :? :lol:

I am glad that I am not the only one who saw that and loved it?

Unless the super cap is poaching  I figure 2 to 3 years. If the summer has been too hot I sometimes just replace the battery in a year .   But I buy the batteries in bulk, about 1.50 a battery.. 
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: Stuntman on November 21, 2016, 05:03:30 PM
Panasonic CR123a, 1550 mah, 3.0V Lithium.

Probably a dumb question.. these batteries do not appear to be re-chargable.. does the Vantage Pro not recharge the batteries with the solar? Does it just use the solar when it can, and the battery the rest of the time?

I've had the same battery in my Vantage Pro for at least 10 years.. how is that possible if the battery is not re-charging?

Thanks!
Title: Re: Davis Vantage Pro2 ISS Battery Life
Post by: niko on November 21, 2016, 05:21:03 PM
Probably a dumb question.. these batteries do not appear to be re-chargable.. does the Vantage Pro not recharge the batteries with the solar? Does it just use the solar when it can, and the battery the rest of the time?

I've had the same battery in my Vantage Pro for at least 10 years.. how is that possible if the battery is not re-charging?

Thanks!

The solar panel charges the super capacitor which runs the ISS and stores energy for use when there is no solar. With no solar, and no remaining stored solar, the battery is the source of power. You are fortunate to be in a very sunny location, a ISS located in the U.K. for instance will be using the battery a lot more. The ISS power consumption is very low, it just takes a quick little sip of power each 2.5 seconds. You are fortunate to be in a very sunny location, an ISS located in the U.K. for instance will be using the battery a lot more. Having said all that, nothing lasts forever so with the shorter winter days upon us I strongly suggest you replace the battery now before it finally expires. If you have a meter please post the voltage of the old battery  :)