machine for cutting Moser ChromStyle 1871. The native battery costs about 1100 rubles, and the control board 2000 rubles. I replaced the motherboard for TP4056 for 0,25$, and the battery for a 18650 lithium battery costs 3,2$. Now the machine can not be discharged to the end before charging, but put on charge at any time.

TP4056 board
http://ali.pub/25lcvz

Battery 18650 LG M26
http://ali.pub/25lcwy

samsung battery 25r 18650 with terminals
http://ali.pub/25lcza

18500 battery with terminals
http://ali.pub/25ld0n