The results in the graph are from tests carried out with 2 x AAA batteries in an electric toothbrush until it no longer had the power to vibrate with a light press on the brush.
Over 5,500RPM = Excellent speed. Toothbrush works perfectly with a strong vibration.
5,000 to 5,500RPM = Very good speed. The toothbrush worked very well – slightly slower than excellent but perfectly operational.
4,500 to 5,000RPM = Good speed. The toothbrush worked well – slightly slower than very good but fast enough to be operational.
4,000 to 4,500RPM = Just OK speed. The toothbrush worked but not with any real power.
3,500 to 4,000RPM = Poor speed. The toothbrush vibrated however the speed was slow and there was little power. Frustrating to use.
3,000 to 3,500RPM = Very poor speed. Not enough speed to adequately clean teeth.
Less than 3,000RPM = Cuts out when pressed against teeth.
The Volt battery provided enough power to enable the electric toothbrush to operate effectively for significantly longer than any other NiMH rechargeable or Alkaline disposable battery.