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Humminbird Fish Finder Lithium-Ion Battery – 15 Amps Hour – Humminbird 7700321 Replacement 15Ah lithium battery for portable and ICE fishing systems. These models have the ability to indicate whether you have lead acid LFP or NMC Lithium battery types. All other models do not have menu settings to adjust for these types and could result in false readings with lithium batteries 11.1 volt 15 AH lithium battery with Dual USB Ports: Keep your electronics charged and power accessories while out on the ICE. Battery Level Indicator: Always know how much charge is in your battery.