Hi Vikki (and any other Wisper owners)Some additional comments:
The red light was on most of the way home but it felt like there was ample power, although the last mile was a bit less punchy.
The three lights on the right handlebar don't mean a lot when you're moving. The green one comes on when the battery is close to its fully-charged voltage. The yellow one comes on about half a volt below that. The red one is on all the time the bike has power.
You should not be using motor power if you want those lights to mean anything. You may well find that even with a fully charged battery the green and possibly the yellow lights will both go out if you're driving the motor hard. Take a look as you're running downhill at a good speed (or stop pedalling and shut the throttle for a few seconds).
Rog.