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The Norsk 16.8V 20.8Ah Lithium-ion Battery was designed to provide portable power for high-draw digital ice fishing electronics with larger displays. The 16.8V Lithium battery provides clean power at a supremely light weightthree times lighter than an equivalent lead acid battery! An advanced Battery Monitoring System protects your battery from pretty much everything you can think oftoo cold too hot having the cables connected to the wrong terminals overcharging short circuiting the BMS will make sure your battery works as it should for as long as you need it. 16.8V 20.8Ah lithium-ion battery Provides clean power at a higher voltage than lead acid or LiFePO4 batteries Delivers clearer images with less clutter and interference when used to power digital sonar with a live-imaging transducer Improved runtime Lightweight at just under 4.2 lbs. Battery Monitoring System protects the battery from charging in temps that are too cold protects against short circuits and overcharging Dual USB ports Battery-power indicator Includes battery charger Over 1000 charge cycles Order today!