4.2V into 1 bank of cells all connected together. They are all the exact same voltage-balanced. (3V to 3.5V has so little energy that ganging them together has a minimal equalization transfer rate.)kje wrote: Isn`t it dangerous to bulk charge all the cells simultaneously without balancing?
Why do you charge them to 4.25V and not 4.20V?
What copper wire and dimension will work for a battery pack like this?
Charged to higher voltage so that self-discharge will be more immediate and readily evident. (4.25V no longer used, I tend to charge to .05V above final use voltage and allow a much longer period for "bleed down" - self-discharge.)
3.6V red Sanyo cells charged to 4.10V and confirmed above 4.05V retained as final use voltage, other voltages for 3.7V rated cells. See - Determining Optimal Charge Voltage
I like to maintain "rated" wire gauge for continuous use.
But also consider brief-surge use at ~200% of "rated".
14ga = 15A continuous = 30A brief or surge
12ga = 20A continuous = 40A brief or surge
10ga = 30A continuous = 60A brief or surge
My eZip bikes use a 40A fuse and 14ga wire ... I rebuild packs with 12ga or better - (very heavy tinned copper braid)
Do not forget to add a fuse to your pack build!!!
One little mistake-misstep can cause a whooole lot of grief!!!