Hi there, I'm going on a trip soon and I noticed that my n3ds battery isn't what it used to be. Now even with the low brightness-no 3d-power saving combo I only get 2 hours. I do have a li-po and some 18650 lying around that I wanted to use for a project and I think it's the perfect time to try it out but I wanted your opinion first. Can I use those batteries in a 3ds and will it work with its internal charging circuit? Everything I have on hand is 3.7 volts. PS: another question if I may, anybody here ever put two 3ds batteries in parallel? Did that work out?