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Garmin StreetPilot C330 from 2007. Revived it's proprietary 18650 battery using an OPUS BT-C3400, and a bit of jerry-rigging. : r/techsupportmacgyver
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Battery Charger Analyzer Tester for Li-ion NiMH NiCd Rechargeable Batteries C3400 BT-C3400 AA AAA C 18650: Amazon.com: Electronics
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