I have seen 14+volts , but it usually says only 13.7 or 13.8. should i worry ? no
this reading is according to my USB ps, volt meter, cig lighter adaptor device thingy.

Aanywayys, motor spinsn starts real quick every time ,and the stereo dont dim the lights .

Also, i do leave my bluetooth OBD/ Dashcommand dongle plugged in , all the time.
i do have real good battery ( a Varta ,overspecd but smaller)

battery quality is very important with our cars. low volts = sparking relays and all kinds of crap.
. plus driving 50 kms per day ,all highway. That Helps :-)