====== Charging voltage ======
  * Old Sb-Sb: 
    *** max 14,5V** (2,42 V per cell)
    * float 13,2V (2,2Vpc)
  * Ca-Ca (most batteries up to 110Ah):
    * **16,25V** (2,71 Vpc)
    * float 13.1V (2.18Vpc)
  * Gel (old):
    * 14,1V (2,35 Vpc)
    * float 13,2V (2,2 Vpc)
  * AGM:
    * 14,9 V (2,48Vpc)
    * limit/hold: 15,6 (2,6 Vpc)
    * float: 13,6V (2,27 Vpc)
  * Sb-Ca (deep discharge / special / over 110Ah):
    * 14.55V (2,43Vpc)
    * absorption: **16,45** (2,73 Vpc)
    * float: 13,1V (2,18 Vpc)