Makeblock Ultimate 2.0 - Battery Issues and Specifications; mCore Working Voltage and Protection; mCore Battery Holder Dimensions

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Issues related to Battery
1. What is the working voltage of the mCore?
A: 3.7V-6V
2. While the lithium battery of mBot is being charged, is there any protection?
A: Yes. It has over-current and over-charge protection.
3. What is size of mCore battery holder and its cover?
A: Size for the battery holder cover:
Size for the battery holder: