SL102, SL202, SL310, SL420, SL502, SL620, SL720, SL820. WB150F, WB151, WB500, WB550, WB700, WB710, WB750, WB850, WB850F, WB855, WB855F. Smart LED charging status indicator. Prevent battery from overcharging, short circuit, and electronic shock.
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