Mr. Andy ChengWhat can I do for you?
Shenzhen Glida Electronics Co., Ltd.
OEM is "original equipment manufacturer" which means the battery is identical to what was originally supplied with the phone. Non-OEM is a battery made by a different company that reverse-engineered the original battery and started producing functionally-equivalent copies for sale into the same application.
There is no hard and fast rule, but generally people perceive OEM to be higher quality and more reliable than non-OEM, as a result pricing will often be higher for OEM Batteries. Batteries are difficult to manufacture consistently because minor variations in water content (parts per million) and minor mis-matching of the anode and cathode capacities (produced by micron thickness variations in coating processes) cause substantial cycle life reduction in the final battery. It could be the difference between getting 100 cycles out of a battery (not to hard) versus 500 (more challenging). OEM's might have a higher reject rate of marginal batteries, which leads to higher costs on the ones that do pass.
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