207 charging problem help

friends 207 1.4 my car was running out of battery was broken, today I bought and installed new battery but when we measured the charge it showed 12.8, then we measured the charge when the car warmed up, it was 13.4, the warning on the battery did not appear in the indicator, but the master said, I need to get up to 14v. what are your suggestions advice

I don't think this is a problem, use it a bit, if there is a problem, the vehicle is self-evident

I used the battery is exhausted, I wonder if there are diodes break out