Clipping of battery.
“All these things must sell... […] * Motorola Cell phone bat/case/no contract”
“[T]he razor was allways^([sic]) planed^([sic]) to be a thinner PalmIII with Li-Ion bat and a better LCD (i.e. less glare and more contrast)... […] You can replace it in the same way than^([sic]) the Cell Phone bat's...very easy !!!”

Etymology: Possibly a variant of bate.

To flutter
“to bat one’s eyelashes”
To wink.
To flit quickly from place to place.
“I’ve spent all week batting around the country.”
“The "Star" is batting along at about a mile a minute, chattering away at the chimney and snatching small coal off the shovel.”