On your device there is usually a sticker next to the nameplate with a 2D bar code and the serial number (7-digit alphanumeric, i.e. numbers and capital letters).
The serial number on the sticker shown here is only an example!
Suitable products
Cordless Impact Drill
TP-CD 18/80 Li-i BL (2x2,0Ah)
TP-CD 18/80 Li-i BL (2x2,0Ah)
Power Tool Kit
TP-18V TwinPack BL 2x2Ah;EX;UK
TP-18V TwinPack BL 2x2Ah;EX;UK
Cordless Impact Drill
TP-CD 18/80 Li-iBL 2x2Ah;EX;UK
TP-CD 18/80 Li-iBL 2x2Ah;EX;UK