Good day I would like to ask for help to someone with knowledge about electronics that can help me with a battery modification to my GBA sp. I recently acquired a 2000 mah 3.7v lipo battery to change it for the original one (it was already in bad shape and did not support the lcd mod and omega de) is a common battery from AliExpress then it has no protection circuit and that makes me not know how variable can be the voltage of the battery when charging or when fully charged and I do not want to damage the equipment. I was thinking of connecting it together with a tp4056 (taking voltage to the input gba, the battery to the tp battery terminals and the tp voltage output to the sp battery connector) but I really don't know if that way is protected the console if the battery voltage is higher than the original or I would need to do something different. I hope someone can help me, thanks!
I attach images of the model of the tp circuit and the specifications of the battery that the seller gives
I attach images of the model of the tp circuit and the specifications of the battery that the seller gives
