Quote:
Originally Posted by stinglikeabee
Sigma, National Battery (all black), Enersys, MK all worked well.
We had a couple of Sigmas and National Battery that had questionable cells, so we reserved them for non-competition. This is likely what you're experiencing too. For the most part, the Sigmas have been good. I did notice that the Sigma batteries we bought in 2012 are different than the Sigmas today in terms of color scheme and price (almost $10-13 more each!).
How long have the batteries been sitting? SLA needs to be charged to 100% every 6-9 or so when in storage.
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Our Werkers lasted through a match just fine, but had odd charging right from the store. We use a ten battery battery tender unit and they never reached full charge on that unit. Tried a higher end Optima charger/maintainer and had the same result. The KOP charger never passed 75%. But the batteries got noticeably warm to the touch. Voltage read fine (13.4-13.6V) at full charge, but using a automotive load tester, we only got readings of 140-165 CCA. The Enersys and MK batteries all came in around 220-230 CCA.
We use the battery tender unit on the batteries for a week or so every month or two.
No matter what the care was, I still wouldn't recommend the Werkers as they both were lower performing straight off the shelf. We even picked the newest ones they had.