Which Battery to Buy?

[protoserge]

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 weeks or so when in storage if I recall correctly (pinging adciv).