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I have a dedicated lithium battery (Dakota) for my FFS. This fall I'm making the switch to lithium for my TM. At the same time, I'll rewire my other sonar units into the FFS lithium battery. Performance (clarity) and durability (esp in hot weather) is markedly improved with lithium. If you fish 12 months out of the year, you'll wanna do some homework on lithium performance in cold weather. Not all lithium batteries are created equal.
