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So i can use identical nimh 1600mAh batteries in parallel? They need the same full charge at the start? Do they're discharge rate the same in most instances?
I thought it was pretty safe to parallel batteries as long as they're the same chemistry (ie nominal voltage), regardless of capacity. Well that's for lead acid, maybe it somehow doesn't work here.
But in parallel if one battery is weaker, the other will pull it up because they're forced to be at the same voltage.
Another caution is the amp-hour rating is usually defined for a 20 hour discharge. The faster you discharge, the less capacity you get.
Each battery is build by a number of cells (re. your description of problems with serial connections) and while new will work well, but each charge/discharge cycle will emphasize what was initially minute differences and this accelerates, since the weakest cells will weaken more than the strong cells.
Quote from: nottoooily on February 14, 2010, 02:01:15 PMBut in parallel if one battery is weaker, the other will pull it up because they're forced to be at the same voltage.Depends on the viewing angle, you might say that the weaker cell will pull the other one down.