Want to bump up the capacity from 650mAh to 900mAh? Want to do it really cheaply (possibly cheaper than a replacement stock battery)? Oh boy do I have the mod for you. This mod uses two things and is 100% reversible as it requires ZERO modification to your SP. It does require soldering but NOT to the SP.
Check out my shared project on oshpark:
or the github repo I made for this:
You can also download the board files there but if you need gerbers or just want a file with one board instead of two, let me know and I can create a github repo with a few different versions.
These are the specific batteries I ordered: but there may be higher quality or cheaper options (or both).
It's $2.70 USD for SIX PCBs. Shipped. The batteries are just over $3 per cell (if you get multiples). So if you do four mods, your cost per mod is about $3.80. GBA SP batteries are between $6 and $12 on aliexpress and at only 60% the capacity, that seems like an awful deal in comparison.
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