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Rtc has a very good accuracy - max 10 seconds per year. Excellent. If you want to use the module with the CR2032 battery, you must disconnect the charging circuit. Google helps :-)
Verified purchase: Yes | Condition: New
Comes with a lithium battery (which I originally thought was rechargeable). However, it is a non-rechargeable CR2032 lithium. The module also includes a charging circuit, which will send power into the battery at around 4.3V when powered up from 5V, so either the charging circuit needs to be disabled (my choice), or the battery swapped for a LIR2032. Other than that, quite a nice unit.
Verified purchase: Yes | Condition: New
Tested and recommended for Arduino UNO
Verified purchase: Yes | Condition: Pre-owned
Verified purchase: Yes | Condition: New