I can't simply tie one battery's negative pole to the next one's positive pole because when the charging circuit kicks in, current will flow all over the place between them. It just won't work.
No two batteries are the same, it doesn't matter what chemistry. While NIMH may be less of a headache than using LiPo or Li-Ion, the same rules still apply as far as keeping them balanced. Over time, they too will become unbalanced if you charge them in series, as will any pack that doesn't have a proper charging circuit to monitor each cell. The question becomes: how long will they last comparatively ...
The idea that all cells connected in series will inherently drift into differing charge states simply does not make sense.
Li-Po battery pack manufactures have a specific process ...
Quote from: retrolefty on Jan 11, 2013, 05:02 pmLi-Po battery pack manufactures have a specific process ...I absolutely understand that's the case for LiPos, and how that has led to the need for each cell to be charged and managed individually.My comment was in response to an earlier post suggesting that this behaviour was something that inherently applied to all types of rechargeable battery. It does apply to LiPos (and there may be other exotic battery types that it applies to as well) but there are many commonly used rechargeable batteries that it does not apply to.
It does apply to LiPos (and there may be other exotic battery types that it applies to as well) but there are many commonly used rechargeable batteries that it does not apply to.
Over-dischargingA complete discharge of a cell until it goes into polarity reversal can cause permanent damage to the cell. This situation can occur in the common arrangement of four AA cells in series in a digital camera, where one will be completely discharged before the others due to small differences in capacity among the cells. When this happens, the good cells will start to drive the discharged cell in reverse,