Battery 18500 Rechargeable Batteries, Li-ion Battery 1000mAh 3.7V

Opened up my Krikzz Joyzz controller where the battery wasn't lasting very long and found it to be swollen.Haven't seen this size and type of battery in a very long time and was surprised they're still produced. Ordered this one and installed it. Works great. Not sure about long term reliability, but if I get a few years out of it, I'll be happy.Old one was an official Nokia battery and lasted 4+ years.