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what are the spec’s one would need for the marine battery per a Hammerhead?
We suggest the use of a 12 volt deep-cycle marine battery and a minimum 6 amp automatic charger. Marine batteries typically come in series sizes 24, 27, and 31. The bigger the battery, the longer the run-time. Avoid marine starting batteries. A general purpose trolling motor battery will work fine. Sealed, or maintenance-free batteries are a good idea so you don't have to check liquid levels.
Your charger should be able to handle 6 amps or better. Most automatic chargers have different settings for 3 amp, 6 amp or 10-15 amps. For full overnight charging, you should use a 6 or 10 amp setting. Avoid rapid charging a marine battery and charge the battery all the time, regardless of how much you used it.
These items are available at super stores, marine supply stores, auto supply stores, and some buyer's clubs. Make sure you charge your new battery before using it for the first time.