Shark IZ162H Replacement Battery 21.6V XSBT620

Shark IZ162H Series — 21.6V Li-ion Replacement Battery (XSBT620)

This is a 21.6V 3000mAh (64.8Wh) lithium-ion battery for the Shark IZ162H cordless stick vacuum and related models including the IZ162HC, IZ163, and IZ361H. It replaces OEM part numbers XSBT620 and XSBT620EU. Capacity figure is taken directly from product specifications — 3000mAh at 21.6V nominal.

• IZ162H platform compatibility: The IZ162H, IZ162HC, IZ163, and IZ361H all share the same 21.6V battery rail and connector footprint. The BMS handshake protocol across this family is identical, so the replacement cell communicates with the charger and vacuum motor controller without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the IZ162H platform. The BMS responded correctly to the charger's wake signal, accepted a full charge without fault codes, and the motor controller accepted current draw across both standard and MAX suction modes.
• Dock charging habit on the IZ162H: This vacuum's dock does not cut power once the battery reaches full charge. Leaving it on the dock continuously forces a slow trickle that degrades cell capacity over months. Charge until full, then remove the vacuum from the dock between uses.

Suction dropping before the battery indicator reaches low

The IZ162H motor pulls significantly more current when the filter is partially blocked — the battery voltage sags under that extra load even though the cells still hold charge. The BMS reads the voltage drop as low state and throttles output to protect the cells. The battery indicator stays green because resting voltage recovers the moment load drops, so the display lags behind real-world cell stress. Clean or replace the foam and HEPA filters first — if suction recovers to full strength, the battery was not the problem.

Motor cutting out mid-clean and then restarting after a pause

This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked brush roll, clogged filter, or a sealed floor nozzle — the motor strains against the blockage and current spikes past the BMS cutoff threshold. The BMS opens the circuit to protect the cells, and the vacuum goes silent. After a short pause the BMS resets and the vacuum restarts. Clear the blockage and check that the filter is clean before concluding the battery is at fault. If trips continue on an unblocked vacuum, measure resting pack voltage — a healthy 21.6V nominal cell should read between 23V and 25.2V fully charged.