This problem exists on other Pedego models as well including the Interceptor, City Commuter and Boomerang. All use a rectangular battery which slides into a plastic housing. I use the following tricks to ease battery removal from my Interceptor:
I wipe down the battery and the interior of the battery housing regularly. Over time, grit & road debris work their way between the battery and case making removal more difficult. While covering the battery contacts, apply a VERT LIGHT coating of dry silicone spray to the cleaned battery. Do not spray anything into the bikes battery housing.
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I found the best approach to removing the battery is this:
Place your right foot behind the rear tire to "chock" it
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Hold the key lock open with your left hand and the battery with your right.
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Rock the battery back and forth as you draw it out.
Keeping the battery & case clean is the trick. I ride gravel trails and have a frequent problem with grit in the battery case. To help minimize this, I made a "mud flap" from a piece of poly carbonate sheet.
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It easily attaches to the rear bolts of the battery case keeping most road dirt off the underside of the battery and out of the housing. For models with fenders, including the Latch, this flap may not offer much additional protection though.