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How can I check TL431 to know it is damaged or not?

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To charge a lead acid battery you need to limit both the current and the voltage.

The current needs to be limited to a level safe for both the charger and the battery, and the voltage needs to be limited to 13.8V (for a 12 Volt battery).

The charge current will automatically taper off as the battery voltage reaches 13.8.
 
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