This just occurred to me. I want to re-emphasize something from the guide:
The new batteries MUST be the same voltage before you install them. If they are too different, it is possible that the current flow will fry something on the board. I don't think it would necessarily happen (there may be safeguards), but it's possible and you should be aware of the chance. Make sure that you even out the batteries before you solder them on. I'll add emphasis to this in the guide, too.
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