Davis Vantage Pro2 ISS Battery Life

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?