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I had an 10 cell 8000 mah D cell NIMH battery pack for my FF. Almost 16 volts off the charger and 14 volts most of the time. Garmin is rated from 9 to 20 volts. Worked excellent but had to be charged every week, and the night before fishing. As you know, nimh has a seriously high self discharge rate.
It would die after 6 hours in the water and for sure would not last much the next week after a regular fishing session. The main reason I ditched it, besides the trouble of having to charge it every night before fishing, is that after 1 year, salt came in the battery pack despite heat shrink and silicone sealant. The threat of a short got the best of me. You don't want a shorted nimh pack in your yak in the middle of the ocean.
/bing
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