I have an old 3S 12Ah lead-acid battery pack that's too heavy for my needs, and too old for being any good. It's being used on a 250W nominal e-bike. Instead of replacing the lead-acids which would cost around €160, I am thinking of building a pack with Sony Konion US18650V3 2250mAh cells, arranged in a 3P10S fashion (6.7Ah), since I only use the e-bike for around 5km daily and would really like a MUCH lighter battery. I will also probably need a new charger of course. That would cost me €80 for the cells, €10 for the BMS and around €20 for a new Lithium charger, for a total cost of JUST €110!
Given that US18650V3s are rated at 10A maximum, would it be OK to use them in such a configuration along with a 35A max 10S BMS, or should I add another row of cells in parallel, making it 4P10S? Would a 250W nominal e-bike motor ever draw over 30A of current? The lead-acid battery case is equipped with a 25A fuse that never failed.
Last edited by thanar
on Jun 13, 2018 9:27 am, edited 1 time in total.