If you poke around at the Ballistic site, you'll also find a 5200mah MS pack for $49, and a 7800mah pack for $80. You can add a charger for $15. The 5200 looks like a bargain (about the same cost as the Gemini) as long as there is no HazMat fee. Seems easy to like a battery from a US RC source.

Almost like a cottage industry popping up with MS battery solutions.