Deleepow AA Rechargeable Batteries Lithium, 3400mWh 1.5V with 2 Hours Fast USB LCD Charger, for Household, Cordless Phones, Remote Controls, Electronics (4 Pack)

I use these in my Roland AX-Edge instead of the recommended NiMH batteries. They work fine but the battery life seems shorter than I expected. UPDATE: I ordered a second set and one of the batteries would not charge. Returned that set and ordered a third set. Initially, 2 of the third set did not charge at first but after a few minutes began to charge to I chalked it up to a fluke. 7 of this third set are working fine now after a month but the 8th battery in this set still refuses to charge at first but begins to charge after 2-10 minutes. It doesn't seem to depend on the charger position so I'm sure it's the battery. Too late to return this set but am wishing I had 1 or 2 spare batteries in case this bad one and perhaps others go completely bad at some point.

Don’t lose charge like NiMHD batteries when stored so far working as expected. lithium batteries will work right up until they stop, they don’t sort of slowly go down and give you notice of impending need to replace, so keep that in mind and replace them on a schedule.

Not good for the money.

Wow, great batteries.. This is my second purchase of this brand of battery.. The last purchase was a few years ago and those worked great.. These work even better.. Seem to be an updated design with great voltage and capacity.. I'm a happy camper and have great output.

There was a defective battery in my pack and the company sent out not only one battery but a whole pack. Excellent customer service excellent!