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I got the Garmin sv7 and it has features I'm still learning. I am powering it with a Lithium Polymer 3 cell battery that is 4500maH. I used it Wednesday for 5 hours and still had power left. The battery weighs about 1/2 pound and I carry an extra so if one runs out I have a spare. I mount the battery on the ff mount so everything is together. You have to use a charger dedicated to LiPo but since I fly radio control airplanes these are batteries I have around and the chargers. I like this setup because it makes battery storage easy.
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you can't eat it if you release it
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