It seems that with LiFePO4 a specific voltage charger is needed. 20 cells require 71.4. This seems to match the BMS of 20s and what the spec sheet for A123 M1 cells is. I am not sure if there is a better option for buying in the USA. Everything seems to be made in Asia. I couldn't find a single seller of both charger and BMS together so finally I think I have pieced the puzzle together. I am not married to either item. If anyone has a better suggestion please enlighten. It is for a small e bike battery pack probably 5ah that is two strings. Thanks. Lawrence Rhodes https://www.ebay.com/itm/60V-5A-67-2V-71-4V-73V-17S-20S-ebike-Li-ion-LiPo-Lifepo4-Lithium-Battery-Charger/312684925796?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20200520130830%26meid%3D89bcfc54686241bb92a40432fb12948c%26pid%3D101195%26rk%3D4%26rkt%3D12%26mehot%3Dpf%26sd%3D264701434821%26itm%3D312684925796%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv5PairwiseWebWithBBEV2bDemotion%26brand%3DUnbranded%2FGeneric&_trksid=p2047675.c101195.m1851 https://www.ebay.com/itm/20S-30A-40A-50A-60A-LiFePo4-Battery-BMS-LFP-PCM-SMT-System-20x3-2V-eBike-Battery/323831696560?hash=item4b65df8cb0:m:mEobXY7F5bWlBj9-GZIqnHQ
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