Background white or black? Battery consumption

1. Is there a difference? Probably. Can you measure it? Most likely. Do you need extremely precise and expensive instruments to do so? Yes. Will you notice any difference between black or white background with regular usage? F-ck no.

The best answer i find for you:

gaijin said:

MIP (Memory-in-pixel) transflective LCD. What this means vis-a-vis power consumption is that only the pixels that change must be refreshed. Once a pixel is set (black, white, etc.) it requires no power to maintain that state. If that pixel's state is changed, it requires the same amount of power to change its state no matter what state it is currently in. Black background, white background - no difference in power consumption.

If you have the solar model a white background might give you a tiny bit more charging since white reflects more light and therefore can go through the solar glas a 2nd time instead of heating up the watch with a dark background. Differences might be marginal.