Claiming "over charge protection" with nothing but a seven hour timer is a lie. What BS to suggest (by Kumu-world) that a real engineer would say any NiMH would not be overcharged by always applying seven hours of charge no matter its starting charge level. They are despicable liars and a cheats -- they should be ashamed.The most likely reason reviewers here complain their batteries didn't last long is that they did not use them "properly." There are no instructions so it's easy for them not to know. Note these are NiMH (and not Lithium, like MS's OEMs, or NiCd) batteries wrapped together. NiMHs often exhibit a memory problem. When you first get these, you should fully charge (for 7 hours) before using them. The real problem is not the batteries but the dumb charger - it simply charges both packs for seven hours and stops. It has a timer and that's it. If you use one pack and put it back in, BOTH will be charged for another seven hours. So, duh, don't do this. This seems designed for use with one controller where you use a battery until the console complains of low battery. Then, exchange the packs so that there's only one battery at a time in the charger. If used this way, the batteries should last for 11 hours of gaming and then require / get a 7 hour trickle charge for like 700 chargings. If you game a couple hours a day, the batter packs together should last a single user for up to a decade (best if you don't use to totally discharged). However, if you use a battery pack for say an hour and then return it to the dumb charger it comes with - it (both) will be overcharged (for seven hours), shortening the capacity and/or cycle life of all the batteries significantly (maybe even to months). You could buy four Energizer Rechargeable NiMH AA Batteries (2000 mAh) or better four Bonais (2800mAh - for 4-6 hours more) for $9 and get a SMART AA charger such as a UTHCracy for $8 and spend only $17 instead of $23 for this setup with fewer issues. That is what I wished I had done. I did not consider this would ship with a DUMB charger at this price (from such an obviously dishonest vendor). Also, don't drop (or throw your controller across the room, lol) - NiMHs easily damage internally (possible in shipping). Now, if you want fast charging (just over an hour), more durable Lithium say with an external mini USB port, you'll have to pay much more.Bonai 4 Packs 2800mAh AA Rechargeable Batteries 1.2V Ni-MH Low Self Discharge - UL CertificateUTHCracy 4-Pack 2800mAh NiMH AA Rechargeable Batteries with Smart Battery ChargerNiMHs maintain 1.2 volts while say alkaline batteries start at 1.5 volts and drop to less than 1 volt so the voltage difference doesn't matter. And, the included charger should not be used for non-NiMH batteries. Heck, it also shouldn't be used for other NiMH batteries as they will likely use a shorter charging period. Do not throw these battery packs out - recycle (drop off at electronics or battery store).
Works like a charm! It was just wonderful and kept my controllers charged for a long time. Sometime when it is fully charged, itll go back to ree, but it is actually fully charged. It caused no problems so itll stay at 5 stars!