Author Options:

Recharging Li-ions in parallel Answered

Hi I am new to rechargeable cells.For my application, I need 2 Li-ion cells (LIR2032) in parallel to increase the capacity. I am using NCP1835B charger IC . Can I use the same IC to charge them while they are in parallel. Is there any extra protection circuitry to be used? What happens if the 2 cells are at different voltages initially ?Will the trickle current bring one of the cells to proper voltage while not affecting the other one?



12 years ago

Li-ion can be charged in parallel. You should connect them when they're at the same voltage (or very nearly so), after which they should be self-balancing. (but if you connect a fully-charged cell to a nearly-dead cell, the charge current would probably exceed the allowed limit.)