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The EliteBook 820 G2 is a 12.5" business-oriented laptop manufactured by HP in 2015.

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How to reset CMOS battery on HP Elite book 820 g2

Reset CMOS battery on HP EliteBook 820 g2

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Here's the maintenance and service guide for the laptop.

Go to p.56 to view the necessary pre-requisite steps and then the procedure to remove/ replace the RTC battery (Real Time Clock aka CMOS).

When the battery is disconnected measure its voltage. If it is <2.5V DC replace it.

Search online for 702853-001 to find suppliers that suit you best.

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