my sister has a wall charger that has variable volts. It has a four-way connector that allows for very low voltage to over 12 volts. Her piano she hooks it up to requires a 9 or 11 volts and the wall charger has regulator switches for various volts. It would be great to get one of these and hook it up to a lipo charger, then you'll have a constant 12V flow without any cut-offs. I noticed than when I have my lipo charger to my 12v battery, once the battery runs out, the chargers doesn't allow the battery to charge anymore since there is no more power.