The Amped Outdoors 20Ah Lithium Battery is new for this season and replaces Amped Outdoors popular 18Ah model—yet the 20Ah model is the same size. With a built-in BMS, you'll get charging and discharging cutoff protection for safety and longevity. 
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Please Note: This battery is 1.5 inches wider than a traditional ice fishing 7-9Ah flasher/graph battery. Made to replace the Garmin 12Ah SLA battery with over twice the operating time and half the weight!