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08-15-07, 10:40 AM
This doesn't seem like it would work, but I've been surprised enough times by these batteries to pose the question anyway:
Can I wire 2 36v Dewalts in series for 72V and still charge both of them with 1 stock charger while they're wired like that? In other words, will the stock Dewalt charger handle a big 72V battery when it's used to 1 36v battery?
My current setup for an ebike battery pack is 2 36v Dewalt batteries wired in parallel (bypassing the BMS and discharging directly from the cells). When I charge these I simply set either one of them on the charger and leave them connected in parallel. They are in fact hardwired together. This charges both batteries (in 2 hours instead of 1) but bypasses one of the BMS's. As long as I consistently switch which battery I set in the charger, can anyone guess as to whether or not that's going to hurt my battery life? My theory is that the amount of times I cell balance is similar to people using these in the field - construction or whatever - they are not leaving the battery on the charger long enough to benefit from cell balancing every time they charge it, and I'm swapping the battery that receives the benefit.
Can I wire 2 36v Dewalts in series for 72V and still charge both of them with 1 stock charger while they're wired like that? In other words, will the stock Dewalt charger handle a big 72V battery when it's used to 1 36v battery?
My current setup for an ebike battery pack is 2 36v Dewalt batteries wired in parallel (bypassing the BMS and discharging directly from the cells). When I charge these I simply set either one of them on the charger and leave them connected in parallel. They are in fact hardwired together. This charges both batteries (in 2 hours instead of 1) but bypasses one of the BMS's. As long as I consistently switch which battery I set in the charger, can anyone guess as to whether or not that's going to hurt my battery life? My theory is that the amount of times I cell balance is similar to people using these in the field - construction or whatever - they are not leaving the battery on the charger long enough to benefit from cell balancing every time they charge it, and I'm swapping the battery that receives the benefit.