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There are many reasons why an end-product that contains a replaceable battery must require an authentication method for installing new or replacement batteries. One reason is safety (especially with Li-ion technology). Others include reputation, counterfeit and profit protection.
In this video you will learn a simple way to add battery authentication with fuel-gauging, without requiring battery characterization, using Maxim Integrated's MAX17211.
Time to watch - 6m 52s
Maxim Integrated Related Products - MAX17211