[3600mAh] SPR-003 Battery for Nintendo 3DS XL New 3DS XL LL Game Console, Upgraded High Capacity New 0 Cycle Internal Replacement Battery for Nintendo Switch Game Console with Tool

Install was simple and so far it's working like intended.

I haven't touched my 3DS in years, but my 10 year old recently dusted it off and has been playing all of my old games. Even new, the battery life was merely adequate, but it has been abysmal on account of battery degradation. This replacement more than doubles the capacity at 3600 mAh. By my son's completely scientific and objective analysis, the battery "goes waaay longer now".Changing the battery is a 5 minute endeavor, and this product comes with a mini screwdriver for the purpose. No included instructions, but You Tube is your friend if you don't want to figure it out yourself. I'll update if it explodes or something, but so far so good!