Quote Originally Posted by widow_twanky
Just to point out that batteries will only deliver a certain amount power. Depends on the rating of the battery so it may well be that your battery has just topped out in terms of current it can deliver.

So how would I work out the max current any battery can deliver? In my test I used two 14.2v lead acid batteries in series. (28.4v) there's no ah rating and there not the batteries I intend to use as there really heavy. If it helps ther by apc and out of one of there power backup units designed for computers when theres a power cut. I was thinking of going with lead acid. but I'll wait for you to tell me there pants haha. If you could answer either questions that would-be awesome.