Re-salvaged a battery-powered floor sweeper. Originally, 1999, it had a Ni-Cd battery pack (4 x sub-C cells) which eventually failed to hold enough charge. This was about 9 years ago, so I replaced the batteries with 1.8 mAh sub-C NiMh cells. These lasted OK until recently, 12 hours ago I rebuilt the battery pack with four 2.3 mAh NiMh cells. The original Ni-Cd charger still works as it's only a trickle-charger.