Hi, the battery of the Retroid Pocket 3 and 3Plus is customized for the manufacturing company, so it is not possible to find it in online stores and Retroid does not sell it as a spare part. Can you suggest a battery that has similar characteristics such as size, voltage and capacity? The battery is a 755565 3.8V and 4000mAh (for the Retroid 3 and 4500mAh for the 3Plus), can you suggest a 3.7V battery but with similar dimensions? Better a little smaller, otherwise it does not close inside the case. Thanks