I had an S3 2000mAh 11.1V HyperGo upgrade battery that was either accidentally left on or discharged too low. In situations like this, using a balance charger instead of the standard USB charger can often revive the battery. This particular charger restored the battery to full functionality, and it鈥檚 now working perfectly again. For around $15, it saved me from replacing a $60 battery. It鈥檚 a simple, effective tool鈥攊deal for basic use. For more advanced applications, consider investing in a higher-end charger, but this one is a solid choice for everyday needs.