Cell phone lions in XMs?

[Skv012a]

Could someone please tell me what voltage XMs require to run at all, whats optimal, and whats max allowed before frying it? I might just hardwire a phone lion in to see how it would work. Given it supplies a steady, max voltage until it runs dry, this should work. Then they're MUCH easier to charge, cheaper to buy, and may outlast our current available lion packages.