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"Meindert Sprang" wrote in message
... snip Obviously you don't know what you are talking about. With such a setup you achieve two things: 1) one battery will always be drainen slightly more than the other. Correct (although it obviously depends on usage). 2) that same battery will alway be charged a little less than the other because the charger measures the voltage across both batteries in series. Incorrect. The charger measures the voltage across both batteries in series. The voltage it sees is the result of both batteries being there, not the one with the highest or lowest charge. The charger will charge until the voltage across the two batteries reaches the correct level. Whether individual cells (and being in the same case or in different cases makes no difference) took a longer time to get up to par simply doesn't matter. So eventually that battery will be in a continuous state of being empty. Imagine what happens when you start the enginge or put another heavy load on a series of batteries where one of them is empty: the empty one will be charged by the full one, but with reverse polarity. This is not what happens, and I cannot imagine what scenario you have in mind that could create this situation. Have you ever replaced one battery in a two-battery 24v system with a brand new battery? What happened when you started the engine? I have and I can tell you the answer - the uncharged battery gradually charged, as you would expect. Have you ever disassembled a broken battery pack of some device? In 99% of the cases you will find all cells in perfect condition (charged and all) except one, which was obviously the weakest in the chain, showing a reversed voltage. You have demolished our own argument. All cells were treated identically, yet one has collapsed! You can't use that evidence to support a claim that cells treated differently are more liable to collapse (which I assume is what you are trying to say). Collapse of one cell is the most common mode of failure for wet cell batteries, but it is not associated with differential discharge rates. For years battery manuafacturers have provided a 12v tap across the first eight cells of high voltage industrial batteries. There has never been any evidence that using the tap shortens the battery life, and it has never been the experience of the users. |
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