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That Battery Tender charger will work.
Lithium batteries need less complicated chargers, no de-sulphate mode needed. Which would actually damage lithium batteries. They can also take 10x charge-rate of lead-acid batteries, so are quite robust.
Seems strange that BMS disconnects battery completely when drained without automatically reconnecting. But I guess that makes sense. They want to make sure you're connecting a charger or are going to ride bike to charge up battery. Otherwise with all modern bikes needing small amount to maintain clock & ECU memory, that little bit can completely drain battery rest of way and destroy it.
Heck, I did that by leaving headlights on too long when I went to check postbox. I suppose I can work up headlight-relay that only keeps headlight on when engine's running. Then turns off if you stop bike.
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