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Underground Magnetics HIGH POWER RECHARGEABLE Lithium Battery

High Power Rechargeable Lithium Battery
Together with the Echo 50X transmitter we have designed a new rechargeable battery that will increase even more the operating hours of the UM transmitters.
For example the battery life in standard power mode of an Echo 50X is 50 hrs !!
This battery is compatible with the Echo 50, Echo 60 and Echo 50X transmitters.
Be aware that the high power output of this battery (4.2 v) most likely will damage any non UM transmitter.