I use a version of the Gear4Music pedalboard unit. The base unit is rechargeable and has a big enough battery to enable it to charge the guitar bug. It also has a built in tuner, rotary 'cable length' simulation and a dc out socket to power another pedal.
The bug also has a mute function.
The battery in the base unit has manged to match the life of the one in the bug, recharge the bug and still have charge remaining after the bug has run out of steam for a second time.Pretty pleased with it so far.