POWXS Rechargeable 9V Battery and Battery Charger,NIMH 280 mAh 9 Volt Battery (2 Count) for Smoke Alarms,Guitar, Cameras, Toys & More

This charger worked great in the beginning but after only a couple of months the charger stopped working. The indicator lights flash red and green and the batteries never charge.UPDATE: The seller reached out to me and provided a replacement charger (which is an upgraded version of the original). I've had no problems with it and appreciate the effort from their customer service team to remedy the situation.

These batteries WILL fit in guitar battery sleeves for the active pickups that come in many guitars. They test at 9.1v - 9.3v fully charged, which is really good considering most rechargeables max out at around 8.4v, or 9.6v for the heavier duty ones. I don't know how long they will last with a 280 mAh rating compared to a set I have that have an 850 mAh rating, but max out at 8.4v - 8.6v. Time will tell. Hopefully I'll remember to update a couple of months from now.The only thing I could nitpick about is the covering is sort of like a plastic cover..it's started to pell ever so slightly from prying it out of an instrument, but it doesn't seem to cause any issues, and didn't even lose a star in this review because of it...minor blemish factor.

I will search out better batteries. EBL? Bought it for the charger and to see how these work for guitar pick ups. And they fit and work fine. Taylor guitar pickups can’t be turned off. So many times I’ve left it plugged in only to find the battery dead the next day! Though these don’t last long, I’m not throwing away fried batteries anymoreEdit:I added another star for their response to my review

As reported in numerous other posts, the batteries work briefly but then stop working after the first charge. Perhaps the charger is not "smart" enough to know when they have had enough juice. Failure is conveniently after the close of the return window.Followup: Was refunded full amount without asking after return window closed. For customer service, I raised rating to 5 stars

This is such garbage, you buy it and one has a cover on it and another one doesn't, I clearly got someone else's buggy return. I plugged it in, let it charge all night, light is green, put it into my device, and nothing. I thought what is something wrong with my device, so I swapped out the batter in this 2 pack and same results. I put them both back into the charging dock and weirdly they're both red again even though I only took it out for 30 seconds.I waited another hour, it showed green on the dock, I plugged them into my device, and they're still not working. I put them back on the dock, and again, it's red. I didn't try a 3rd time, I already know I got a bad batch, returning.