It's been done, but it's not recommended. See...
http://dashcamtalk.com/forum/threads/mobius.1303/page-31#post-49651
Thanks for that. Since the only real concern is the physical size of the battery, maybe I'll be the one to experiment. I'll look around for higher capacity batteries with similar dimensions as the stock Mobius battery.
One solution might be to use an external battery to power your Mobius. Some folks here use this method for extended parking mode. One example is the Anker Astro E5 15000 mAh battery. It is about the size of a (fat) smartphone, has two USB ports and can power a Mobius for many hours.
View attachment 4507
Thanks for that link. I've been meaning to buy a backup power bank. If all else fails, I might just go this route.
EDIT:
I guess I'll just go with the power bank option. The best battery I could find is still too large for the mobius case and would need case modifications or a custom case. Thanks everyone for the help.
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