This cartridge (adapter) allows you to place your #18650 rechargeable battery inside so it can be used in your Underground Magnetics transmitter. This cartridge is included in the Mag 8 locator system but can be purchased separately for use in a variety of transmitters. The U-Mag #18650 battery and chargers are sold separately.
Battery Cartridge for #18650 Rechargeable BatterySKU: UM2000130
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