A 3,000 mAh battery for the left half and a 5,000 mAh battery for the right half of your UHK 80. You can either replace worn batteries or add them if you ordered your UHK 80 without batteries.
You can simply tear up the rubber palm rests, lift the plastic cages, connect the batteries, cover them with the cages, and re-attach the palm rests without using any tools.
