Nobody told me making my own eboard will be easy but this battery thing is pretty complicated. I’ve read Micah Toll book about batteries, most of your posts here and I came to conclusion that I’d like to make 10s4p on samsung 30Q (big thanks to @Vanarian). I am also a little confused on best charging option I should choose.
Small footprint internal BMS that I bypass while riding knowing that I have limits set directly in vesc. It would be used only for charging. https://www.aliexpress.com/item/10S-15A-BMS-for-36V-li-ion-battery/1195130789.html Pros: small, cheap Cons: cannot set lower voltage like 4.1V as upper charging limit, need of additional on/off switch
10S 80A Bestech with eswitch Pros: once set works, no need for additional on/off switch, Cons: large, expensive, cannot change parameters afterwards unless you double the price, need to charge while power is on
10S 80A RJXZS https://www.aliexpress.com/item/10S-80A-active-bms-2017-new-Li-ion-smart-bms-pcm-with-android-Bluetooth-app-UART/32839468266.html Pros: Bestech price, adjustable parameters Cons: as large as Bestech, lesser known brand, no built in on/off switch
Option 2 (without eswitch) or 3 externalized for occasional use https://www.electric-skateboard.builders/t/li-ion-battery-pack-without-bms/47818/40?u=webst Under link above @SkaterBoy58 used RJXZS to make external charging station Pros: less electronics onboard, no problem with not working brakes while downhill on charged board, can use one power brick for direct and balanced charge Cons: need of additional on/off switch, large connector, for safety need to direct use of this kind of charger http://www.groetech.de/index.php?main_page=product_info&products_id=837
People mostly tend to choose option number 2 but I’d like something smaller with adjustable parameters. External option is tempting mainly due to space restrictions but then I’d need to use two eswitches which raises the costs, takes enclosure space and fails sometimes. Aren’t there any all-in-one solution, small, with eswitch and high discharge at the same time?