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Rated input voltage
Stable voltage accuracy
-10°C to 40°C
-40°C to 75°C
5% to 95%
The battery voltage should be 13.5V and above when the battery is fully charged, and the voltage should be tested after disconnect from the charge for over 15mins.
If you use the 10A charger to charge the 12V 50Ah battery, it could be fully charged around 50Ah/10A=5hrs.You could check to see if the battery is fully charged.