[Elecraft] [OT] Lead-acid battery question

[Tim Groat]

665 "CA" would be cranking amps (normal temperature), vs. the lower 
"CCA" rating which is cold cranking amps. Unlike marine or RV batteries, 
a starting battery have low ampere hours for its size: it's optimized 
for high current loading, not for run-time.

I agree with those who suggest a good quality float charger to 
continually maintain the battery at full charge. Be sure it has a true 
float mode (not just an automatic charge cut-off), and avoid bargain 
priced chargers (they often have poor voltage regulation). I wouldn't be 
surprised if your generator controller has one; perhaps it has failed.

I hope you get the problem fixed!

--Tim (KR0U)