My feeling is no it's not done for longevity. I have a feeling that brand new cells will stay at 54.6v (13 * 4.2v) after charge but don't need to be in the world long before they no longer keep at the full 4.2v but start to go down. My existing batteries are around 4.16v per cell and I'm guessing the cells are a year old. My son's battery is 2 years old and still around 4.12v per cell. The battery chargers all output 54.6v and the BMS doesn't really throttle the voltage to the cells it's just and on/off. Still if after 2 years we are getting 4.12v per cell that's awesome to me.
Cut off voltage of the standard Moscow?
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My feeling is no it's not done for longevity. I have a feeling that brand new cells will stay at 54.6v (13 * 4.2v) after charge but don't need to be in the world long before they no longer keep at the full 4.2v but start to go down. My existing batteries are around 4.16v per cell and I'm guessing the cells are a year old. My son's battery is 2 years old and still around 4.12v per cell. The battery chargers all output 54.6v and the BMS doesn't really throttle the voltage to the cells it's just and on/off. Still if after 2 years we are getting 4.12v per cell that's awesome to me.
Possible, but I have several chargers and some go to 54.6V, some to 54.0, etc. I think it is more likely it is just a manufacturing tolerance issue. It doesn't really matter a whole lot. I seldom charge to full anyways. Only immediately before a long trip or to balance cells once in a while.
harryS
Well-Known Member
The cells may be close to 54.6V, but the BMS puts a transistor switch between the negative terminal of the cells, and the negative terminal of the load (your controller). It's going to drop a little voltage, and the cells might self discharge a bit too. All told, a half volt loss seems like no big deal to me.
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