Check out powermaster XS series.. those things are beasts.. might wanna check out their lawsuit against kinetik and others on their website.. they are filing a LAWSUIT against other companies for not having products that live up to what the companies say they do...
so if powermaster (steve meade, stevemeadedesigns.com, swears by them now) has the balls to file a lawsuit for that, you know their products dominate and HAVE to do what they say they do, otherwise that lawsuit would have ripped their balls off for false prosecution while committing fraud themselves as well if the products didn't really do what they said they did (because if your products weren't what you said they were, I doubt you would attack others with a LEGAL LAWSUIT for the same thing, that would be suicide). And as compared to Kinetik's top 12-14v battery (HC2400) which houses 2600 Amps, powermasters XS D3100 (I think that's the model number) houses like 3200-3400 Amps can't remember exactly. They are equally priced too, Powermaster being the better bet. check em out.