GBA Battery, Upgraded 2800mAh Ultra High Capacity Rechargeable Lithium-ion Battery for Nintendo GBA SP Gameboy Advance SP AGS-001 with Screwdriver

It's a good battery, but the original 600mah Gameboy Advance SP states that it will last anywhere from 7 to 10 hours with the backlight turned on and about 18 hours with it off. This was tested on the Gameboy Advance SP 001 version/model, which is not the brighter version/model which is the 101 model. With that being said this 2800mah battery right out of the box gave me a good 1 hour and 36 minutes before the red light to charge came on. It then took 1 hour and 53 minutes to get to a full charge. I then tested to see how long it would run. I tested Pokemon Ruby with sound and backlight on the whole time. This 2800mah battery was able to give me a total of 10 hours and 5 minutes of play time. It's a good amount of time that it was able to produced, but it doesn't sound any better than what the original 600mah was said to produce. It's a good product but to say it's a big improvement or upgrade is a no. The installation was easy as the original and fits right in. If your old battery doesn't last more than 2-3 hours or just dead, yes you should definitely buy this replacement! Attached are the times that I screenshotted as I was testing the duration of each phase.

Works great. It was a perfect fit no issues

I was surprised with how quick it charges and how long it lasts. I played for a good 10 hours or more until it gave me the red light. I also always use the backlight, but it can last longer if you keep the backlight off while playing in well lit rooms. For heavy gaming, 2 are well worth it.

Bought for my husband he loves them and says they work really well!

Really good long lasting replacement battery , I play for hours and still put it to charge before it even indicates low power so it definitely will last any binge gaming sessions . It fit just as good as the oem battery and hasn't given me any issues at all.

Had some odd behavior at first - now it acts much like an oem battery. Id say 600-800 mah no more. Im not sure this will last as initially it acted like it was defective - dying suddenly with no red light warning. Now after some cycles its ok. Will update if it fails early.

Everything I needed in one box to replace the battery. It was extremely simple and straightforward thanks to the included screwdriver. This battery has a significantly larger capacity than the original and is a perfect upgrade. Moreover, the battery fit within the housing perfectly, and I have had no issues thus far.

Awesome works great