I'm using Headways (8ah) for my lithium upgrade for the same reasons you are. I built a 4S2P pack of Headways to replace the existing 19ah lead house battery. I'm using an IOTA DC/DC convertor, set at 14 volts. And I'm not using any BMS. Last year I built a 24 volt 4S4P pack for my ebike. After riding 1500 miles last year, it looks great. Last week the cell voltages on the bike pack were all sitting at 3.2 volts after resting for siz months. So I believe it is safe enough to go without any BMS.
BTW, I bought 460 8ah Headways from Manzanita Micro and they are the best! All 460 cells initally charged to 3.7 volts, no clinkers. I found 6 cells where the screw holes and threads are a tiny bit out of square, but not enough to warrant asking for replacements.
BTW, I bought 460 8ah Headways from Manzanita Micro and they are the best! All 460 cells initally charged to 3.7 volts, no clinkers. I found 6 cells where the screw holes and threads are a tiny bit out of square, but not enough to warrant asking for replacements.
