OLED Battery Dispay

Can the OLED battery display be changed to show different types of bmp images to show the battery level, and if so how would that be done

No. Although I don’t think it would be particularly hard to add.
It is however fairly easy to replace the glyph that the battery graph is made of.

It’s defined here:

Note that glyphs are turned 90 degrees.

You may also need to change the “skip” value which basically defines how wide the glyph is here:

(You just change the 16 to something else.)

At some point I need to make it so that images can be used as UV and battery meters. Basically you would just have N images, and it would choose which one to show based on the battery level or sound level.

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This blast from the past might help:

Battery icon.txt (670 Bytes)