Battery calibration? #83

New Issue

2026-10-27T15:37:45+01:00

adam commented

2026-10-27 15:37:45 +01:00

When the battery of my T-Deck is fully charged (blue led on the bottom right isn't on anymore) it will display 85%. Is there a way to calibrate this?

When the battery of my T-Deck is fully charged (blue led on the bottom right isn't on anymore) it will display 85%. Is there a way to calibrate this?

adam commented

2026-10-27 15:37:46 +01:00

I think there are multiple cases describing a similar issue regarding battery charging and battery level:

I think the battery percentage is being calculated based on the voltage, which is reported to be above 4.2V when you plug the device into a charger. As soon as you unplug, the voltage will drop, causing the software to think you are no longer at 100%. There does not seem to be any calibration at the moment, but you can switch to reporting a voltage level instead of a percentage by tapping on the battery icon. That might give you a better idea of the actual charge of the battery.
The improvements I would suggest are:

Change the icon and reported battery percentage from green/100% when charging to something like a "charging" icon (and no percentage in the case that it's physically impossible to determine the battery charge level)
Allow a calibration setting to indicate what voltage corresponds to "100%"
For bonus points: automatically determine what a 100% charge means by taking the highest measured voltage when the battery is NOT being charged. This should eventually lead to a more true 100% than what is currently being used.

I think there are multiple cases describing a similar issue regarding battery charging and battery level: * https://www.reddit.com/r/meshtastic/comments/1fkh0jw/tdeck_shows_battery_charged_to_499v_should_i_worry/ * https://github.com/Xinyuan-LilyGO/T-Deck-Pro/issues/6 * https://www.reddit.com/r/meshtastic/comments/1gli04f/tdeck_plus_battery_jumps_to_100_when_plugged_in/ I think the battery percentage is being calculated based on the voltage, which is reported to be above 4.2V when you plug the device into a charger. As soon as you unplug, the voltage will drop, causing the software to think you are no longer at 100%. There does not seem to be any calibration at the moment, but you can switch to reporting a voltage level instead of a percentage by tapping on the battery icon. That might give you a better idea of the actual charge of the battery. The improvements I would suggest are: * Change the icon and reported battery percentage from green/100% when charging to something like a "charging" icon (and no percentage in the case that it's physically impossible to determine the battery charge level) * Allow a calibration setting to indicate what voltage corresponds to "100%" * For bonus points: automatically determine what a 100% charge means by taking the highest measured voltage when the battery is NOT being charged. This should eventually lead to a more true 100% than what is currently being used.

adam commented

2026-10-27 15:37:46 +01:00

Fixed in v0.9.12.1

Mgmt → Light has a Battery 100% setting (device + WebUI) to set the "full" voltage (3500–4500mV, default 4200).

## Fixed in v0.9.12.1 Mgmt → Light has a Battery 100% setting (device + WebUI) to set the "full" voltage (3500–4500mV, default 4200).

adam commented

2026-10-27 15:37:47 +01:00

Seems it has been fixed -- can you close, @AmonRA, if it has?

Regards!

Seems it has been fixed -- can you close, @AmonRA, if it has? Regards!

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Reference: adam/meshcore#83