Been using these for a little over 2 years and they have worked flawlessly.
I use them for my Xbox Controllers and they give me long battery life and they charge in about 6-8 hours.
I'm planning on buying another 8 probably. All of the other Chargeable Batteries I've bought have been cheap and had crap battery life, but these have been very great. I couldn't recommend them enough.
Here's my Amazon review for this product - https://www.amazon.com/review/R21I2HAI11ATP8/ref=cm_cr_rdp_perm?ie=UTF8&ASIN=B004RP2VNI
