I bought the above-mentioned device - unfortunately, I still cannot charge the internal battery completely. According to the operating instructions, this should be indicated by the green 100% LED which alone is permanently lit - I can connect the booster to the power supply for days (using the original Noco power supply or the USB charging cable), but the display stops at 75%, i.e. 25%(red) and 50%(red) and 75%(yellow) are permanently lit and the 100%(green) LED flashes... actually, at some point (100%) only the green LED should light up... Do I have to send the booster back for repair / replacement? Raoul