I bought the 8-cylinder 2400 amp one. Apart from a dodgy initial charger (replaced gratis by Super Cheap), it has performed flawlessly (the prior charge would make it suffer the beep syndrome just as Patrick mentioned above after 4 to 5 hours). Since getting the replacement charger, it's been out in -4° frost and ice, and not a single issue all night.
I keep mine wrapped in a mylar blanket just to be sure.
My prior yellow 800 amp pack has begun it's death spiral after nearly 8 years solid work - I now use it to power my dewstraps.
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