MSE: A foolproof backup measure

In MSE's application products, as a foolproof backup measure, backup batteries are still needed to prevent circuit failures and other issues. This is even more essential in the initial stage of the product. Even if we have reached the mature stage, to be foolproof, we are still well prepared. As a backup battery, the capacity should be large enough to be fully charged at any time, and it should be automatically turned off when fully charged.