Need a Lithium Battery? for Ditto x4 and TC Helicon Harmony pedal

Need a Lithium Battery? for Ditto x4 and Harmony pedal

I Would like to find a Lithium Battery that will work to power these pedals. I have been using a marine battery but its to big to lug around just for these pedals. Anyone that Knows of a Battery that will work, please help.
Thanks!
Pedal are Ditto x4 and TC Helicon and Beat Buddy pedal.

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Source: http://forum.tcelectronic.com