AKZYTUE 3.7V 4000mAh 606090 Lipo battery Rechargeable Lithium Polymer ion Battery Pack with PH2.0mm JST Connector...

I got it since the battery in my Keychron K6 died, it works great, feels like the original

Recently, I was in full geek mode and decided to update my devices. Flushed with success, I remembered the cheap 7 inch tablet I bought for a project that never got off the ground. Three years of hibernation in the junk drawer meant a new battery was in it's future. Being worth pretty much nothing and not wanting to spend much more than that, I searched out some batteries and was impressed by the price point and the positive reviews this has received. I wasn't disappointed. It works just fine and the extra capacity it is able to provide is never a bad thing. It was almost too thick for this application, but I did manage to get the cover back on and it's working like new. Now, I just need another project for the tablet. Any ideas???

For once I've received a cell that is what it says it is. The measurements are all accurate and doing a capacity test I achieved 4040 milliamps. I'm generally happy to receive anywhere within 10% of the stated capacity anytime it's over that deserves a review from me.

Fits nicely in the PS Vita 1000. Almost double the battery life. (2200mAh upgraded to this 4000mAh). I've done this mod 6 times and I haven't killed a battery yet... be very careful and don't attempt this without adult supervision and safety precautions. Have a metal bucket handy with some pebbles in the bottom to toss an over heating battery into, have safety glasses, etc. If you are going to destroy your official vita battery, charge it or drain it to 50-60% It's safer and more recyclable that way. I'm keeping mine to possibly use on some unknown project that might need an upgrade to 2200mAh. You need special flux to solder the aluminum positive and negative leads though. Warning It's very dangerous - possibly deadly - to puncture or over heat these batteries. The insides cannot touch oxygen or a very hot chemical reaction happens that is more violent the more fully charged so do not cut into the silver wrapper or heat the glue that keeps the battery sealed. What you need from the previous battery is the white wire - thermistor around 10k ohm connected to negative. You can achieve this by using the board from the previous battery - cut the aluminum tabs connecting the original battery to it's board - be careful very careful never to touch positive to negative (red to black) ever or touch anything metal to both of them at the same time (like scissors). desolder the red wire from the 3 on the Sony board and connect that to the red wire coming out of the yellow tape. Connect the black wire from the new battery directly to the other black wire on the Sony board next to the white wire - both already connected to the board. You should have a red wire going directly to the vita attachment and a black wire going from the battery to the sony board and then a black and white wire continue to the vita attachment with the red wire. You can skip the Sony board and add either your own 10k thermistor or a 10k resistor from the white wire to the black wire... I suggest this option and leave the Sony board on it's battery. You will still need the 3 wire connector from the battery. Using a 10k resistor instead of a thermistor means don't try to charge it when it's too hot or too cold or you could damage your battery or start a fire. I don't suggest letting the Sony battery board charge this 4k battery, it wasn't meant for it. The battery comes with a charge board and the Vita itself won't let you over discharge or over charge a 3.7v battery. The third wire tells the vita that it's at a safe temperature to charge and the Vita itself handles over and under charge protection.

Harness wires were reversed! Compare to old plug before plugging it in!