Having learned this, [Jason] from [Rip It Apart] decided to investigate — could this feature be used for charging Li-Ion battery packs ... to work with LiFePO4 and lithium titanate batteries ...

so he decided to splice in some lithium-ion batteries. Not only does the Game Boy now have a new battery pack, but [Alan] was able to source a USB charger to handle the batteries’ charging needs.

safer & as powerful as lithium A battery that's safer and cheaper than lithium-ion while offering comparable energy density? That sounds like a pipe dream. But such a battery is in fact in the ...