The POWER PACKS of AQUA-LUX S100, S80, DIVELITE and the AQUA-TANKS/AQUA-BELTS have a built-in a Thermal-Detector. The Thermal-Detector interrupts the charging line when the temperatur ist approx. =>50°C.
The reset time of the Thermal-Detector is depending on the ambient temperature and the reset time lasts approx. 30-60 minutes. For this reason the battery should be charged in a normal ambient temperature. Do not charge the battery in the sun or on a heater or in extemly cold ambient.