Review on High Performance 4.0Ah KUNLUN V7 Replacement Battery Compatible With SV11, V7 Absolute, Motorhead, Fluffy, Trigger, HEPA, Car+Boat Vacuum Cleaners - Includes Bonus Filter & Brush by Michael Boyd

The battery only lasts about a year. The unit charges too quickly and I'm only able to get about 5 minutes worth of batter use, compared to originally getting 30-40 minutes on a full charge. I suspect that I have a bad cell which is limiting the ability to fully charge the battery and creating the issue. However, a year's worth of use is not acceptable.