Bissell 4166 battery for PowerClean, 2000 mAh

Bissell 4166 — cordless stick vacuum battery for the PowerClean; 2000 mAh. A stick vacuum battery ages by charge cycles rather than by years: after a couple of seasons of daily cleaning it holds noticeably less than it did in the first month, and the far end of the flat gets left undone. A spare pack costs a fraction of a new vacuum and swaps by hand with no service visit — and two packs in rotation cover the whole home without a charging break.