I am using 20 A123 Systems ANR26650M1A. As far as I know as bullet proof as Lithium can get. I am looking at 20s BMS. I am planning on 2P. 5ah 60-72v battery. Yes I don't need full charge. I don't see why I can't just use a 72v charger instead of 73. I don't need the speed or to top off. I am happy with a half volt less and as far as I have heard I will get the same capacity at 3.6 as 3.65vdc. Ergo why not be real safe and go 71.4. That theoretically will eventuality fully charge the battery. https://www.ebay.com/itm/113793800015 This 60 amp 36 dollar device looks good on paper. https://www.ebay.com/itm/72V-3A-Charger-Lithium-Battery-For-Electric-Bicycle-Skateboard-Single-wheeled/323772837631?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908131621%26meid%3Ddce1a10bc7ea4d2e9ddd51e89d26fd45%26pid%3D100678%26rk%3D1%26rkt%3D3%26mehot%3Dnone%26sd%3D323772837631%26itm%3D323772837631%26pmt%3D1%26noa%3D1%26pg%3D2380057%26brand%3DUnbranded%2FGeneric&_trksid=p2380057.c100678.m3607&_trkparms=pageci%3A869b4bb2-aa19-11ea-99bb-74dbd1809381%7Cparentrq%3A97be220f1720aa18f154431bffe9af52%7Ciid%3A1 This charger seems a possibility. https://www.ebay.com/itm/60V-73V-5A-Charger-for-60V-20S-LiFePO4-Battery-Pack-E-BIKE-AC110V-73V-OUTPUT/173860920788?hash=item287aeb1dd4:g:u9UAAOSwYlJW49z1 This is one volt higher. Lawrence Rhodes
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