Moderator, please delete if this isn't allowed. I recently added to what was running on my house battery and needed a little more capacity. The Amped 30h battery I had is 3 years old and still runs like it did day 1 so far as i can tell. According to their site, it will run a Garmin 9" + livescope for 18 hours. They are $199 from Amped outdoors but if anyone is interested in a local pickup in the London, KY area, i would sell it for $100. It is the tall version and very compact.