We have a 1800mAh battery charging at 1500mA, it should take about 2ish hours at that speed. And basically if they output the same amount of power it will charge at the same speed.
I'll order a 1800mAh Cameron Sino battery from AliExpress.
EDIT: The 1800mAh Cameron Sino battery I ordered from AliExpress came with an USB cable for some reason, it's somewhat unconfortable to hold the PSP because of the battery cover that came with the battery to fit it in a PSP 2000/3000/Go/Street, and above all, when charging the PSP, its power LED always turns off some minutes after, so the PSP stops being charged, thus I lost money for nothing. I'll order a new 1800mAH Cameron Sino battery from Amazon.
EDIT 2: The new 1800mAh Cameron Sino battery I ordered from Amazon arrived, it didn't come with an USB cable like the previous but it has the same issue as the other one. I'll order a 2200mAh Ostent battery from AliExpress' Ostent store. It doesn't come with the battery cover but I'll use the Cameron Sino battery's.
EDIT 3: The 2200mAh Ostent battery I ordered from AliExpress' Ostent store arrived and it only worked for some time. It had 68% as soon as I used it (which I find it odd because I think it should be fully discharged), and after fully discharging it and charging it, I turned off the PSP for a week after using it for some time and now I tried turning it on and it has no battery left and it's not charging. I'll order a
EDIT 4: The 2400mAh Ostent external battery I ordered from Amazon arrived and it also came charged like the Ostent battery and it took quite some time to discharge, but like I said, the PSP doesn't blink when low in battery (so, it turns off all of a sudden when it's fully discharged) and the battery icon doesn't appear in the XMB when using it, it's uncomfortable to hold the PSP with it attached, it's tilted since I doesn't fit the back of the PSP properly (maybe it's my fault for not attaching it right), and if I'm not careful, it can mess up the UMD drive when taking it so I'll leave it hanging, thus it won't be tilted and won't mess up the UMD drive when taking it. Even if it's not supposed to use it this way, at least it's safer and it feels more comfortable holding the PSP this way, too. The external battery's LED is red when being charged and turns blue after fully charged.
I don't know if it can also charge the internal battery and I didn't try it and I took it while playing as well. I also don't know if the PSP should even be charged with it inserted (regardless if the internal PSP battery is inserted or not) and I charged the external battery overnight, which I don't know if it's right (I don't know how long it took to fully charge it). A week after charging it, the PSP still turns on (I've been checking every day to see if it still does) so I guess it's not faulty like the 4 internal batteries I used which wouldn't even charge, just for a very small period of time of after being fully charged, the PSP wouldn't turn on the next day. Assuming the external battery is fine, does it mean the PSP has a hardware problem that affects all internal batteries or they are messed up? I find it odd having 4 faulty batteries (3 of them are/were new). If it really has a hardware problem that affects internal batteries, why doesn't it affect the external? Also, I've been using the original battery cover. It seems this external battery can only be used about 500 times.
EDIT 5: I've been told it's quite dangerous for the PSP to turn off without a notice because if it should go out while I'm manually saving (or during an autosave) within a game, I ran the risk of corrupting the game save or, at worst, the entire Memory Stick (which it seems has already happened to some users). Because of this, I was recommend that, when possible, to disable in-game autosave, which usually happens frequently and thus carries a lot of risk. Also, the Ostent external battery can charge the internal battery if used with it. Why is that?
EDIT 6: I've been told it's quite dangerous for the PSP to turn off without a notice because if it should go out while I'm manually saving (or during an autosave) within a game, I ran the risk of corrupting the game save or, at worst, the entire Memory Stick (which it seems has already happened to some users). Because of this, I was recommend that, when possible, to disable in-game autosave, which usually happens frequently and thus carries a lot of risk. Also, the Ostent external battery can charge the internal battery if used with it. Why is that? I think my PSP has a hardware problem since it had problems with 4 internal batteries (3 of them were new) so I guess I'd still have one if I used the external battery to charge the internal.
EDIT 7: Maybe it wasn't a hardware problem when I had the battery which came (the first battery of 4) with my used PSP and even when I got the first (Cameron Sino's from AliExpress) that I ordered (the second of 4) which had problems since it arrived in 2022 and had problems from the start and the original worked until 2023. The following 2 batteries (Cameron Sino's from Amazon and Ostent's from AliExpress) also had problems from the start so could the first internal battery I ordered (Cameron Sino's from AliExpress) and the second of 4 might just have been faulty and the hardware problem which affects all internal batteries might just have arisen in 2023 (the original and the 2 batteries I got after the first one I ordered)? If so, I might have had a great ammount of bad luck and confused a hardware problem with faulty batteries because I ordered 2 when I already had the hardware problem thinking they were just faulty.
