36 V Li-Ion professional battery, 4 Ah, 144 Wh. ActiveCool, IPX4 and integrated connectivity.
Compatible: 520iRX, 535iRXT, 525iRXT, 520iLX, 525iLK/LXT, 520iHE3, 520iHT4, 522iHD60/75/HDR60, 525iHE3/HE4, 525iB Mark II, 530iPT5, 530iP4/PX.
Older battery note: newer BLi-X professional family; verify fitment before substituting older BLi batteries.
Specs: 36 V | 4 Ah | 144 Wh | Li-Ion.