About this replacement
Dyson V7 / SV11 Series — 21.6V Li-ion Replacement Battery (968670-02)
This 21.6V 2000mAh Li-ion battery replaces part numbers 968670-02 and 968670-03 in the Dyson V7 cordless vacuum range. It fits the V7, SV11, V7 Motorhead Pro, V7 Total Clean, and related variants. Swap it in when the original cell no longer holds charge and suction drops off before the job is done.
- V7 and SV11 platform fit: These models share the same 21.6V battery architecture, connector pinout, and BMS handshake protocol. One battery cell covers the full V7 lineup without modification.
- Bench tested on actual hardware: We cycled this battery through the V7's motor controller under both standard and MAX suction modes. The BMS handled current draw correctly at both settings, with no false overcurrent trips during startup.
- Dock charging habit on the V7: Do not leave the V7 sitting on its charging dock permanently between uses. The V7 dock does not switch to a true maintenance mode — continuous trickle charge accelerates cell degradation. Charge to full, then remove the vacuum from the dock.
Cordless vacuum losing suction before the battery indicator reaches low
The V7 motor draws significantly more current when airflow is restricted — a partially blocked filter can push draw well above the rated steady-state figure. The BMS reads this as a high-drain event and begins throttling output voltage before the fuel gauge registers low. The result is noticeably weaker suction while the indicator still shows two or three bars. Clean or replace the filter first, then retest suction at full charge.
V7 motor cutting out mid-clean and then recovering after a short pause
This is a BMS overcurrent trip, not a dead battery. When the V7 runs sustained suction against a blockage or a heavily soiled filter, current spikes past the BMS protection threshold and the pack shuts output to protect the cells. A brief pause lets the BMS reset and the motor restarts. Clear the blockage, check the filter, and confirm pack voltage reads at or above 20V on a multimeter before ruling out a cell fault.