- Thread starter
- #21
The problem people are having with the AGM batteries is they are not charging them correctly. An AGM battery needs to charge at 30 amps and 15 volts which most standard battery chargers can not do. Also and AGM battery can sit for 24 months and retain a full charge. If your battery is going dead after being in storage the problem is most likely a drain in the vehicle not your battery. This can easily be solved by installing some sort of on board battery maintainer.
I'm actually learning something from this thread - many thanks to all.
As to storing and properly charging batteries. I have a high end Snap On battery charger that is capable of properly trickle charging most of these types of batteries. I don't have a drain anywhere - sitting idle has not been good for this last red top. The previous one could sit and sit and sit - and then fire right up. It lived a long and useful life. The yellow top that was far less than 2 years old and never used did not hold it's charge per your statement above. It was dead, toast, nada, roasted, worthless. I don't like rolling the dice hoping I'll get a good one - I expect consistency, especially when the environment and vehicle are the same...and I have to watch my $$$.
Overall - only having had 3 or 4 batteries in 11 years with plenty of hard use - I'm pretty satisfied with the Optima's (except for that damn yellow top) - but have been hearing more and more horror stories about failures. Ironically - I like the compact design of the optima - they did a good job of marketing eye candy.
I'm still undecided between the 34/78 yellow top or the same from Oddyssey - with the 880 CCA and warranty of the Oddyssey sounding like the best deal - we'll see.