Add-on display to existing electric bike * Battery gauge / watt-hour gauge *

Trail Cruiser

Well-Known Member
Hi fellow ebikers,

The one thing that most of us want to know is how much exactly do we have left in the battery. Unlike cars where the gas gauge can give you very good estimates, batteries are different in that you get a better estimate if you know how much watt hour you have consumed.

I asked justin from Grin Techonology in Canada if he can build one with four (4) simultaneous displays. Namely:

1. Watt hours consumed
2.Instantaneous wattage (power meter)
3. instantaneous wh/mile
4. Average wh/mile

Numbers 3 and 4 gives you good idea on how efficient you are using the battery.

Justin said it can be done if there are lots of interest (500+)

What do you think?
Last edited:


Well-Known Member
Hi @Mark Peralta - did anything ever come of this? I've wondered since getting my ebike this month, if there's a more detailed "view" of my battery, remaining power, etc... than the simple "gas gauge" type of indicator on my display...


Well-Known Member
Among the readouts you can include on the custom ride screen on the Bosch Nyon are the following:

  • Current Consumption
  • Current Power
  • Current Torque
  • Battery level in percentage (down to single digit)
And many others


Well-Known Member
I figured it would be -- which is why Mark's post is intriguing, for building a third party system which could (potentially) be applied across different manufactures...