Ben Z
I just charged fully my M8 battery with my charger connected to a portable jumper cable device that has lighter plugs via my car adapter. I tried charging the battery before by plugging the charger into a house outlet the normal way ( i had it plugged in overnight) with no charge up to my M8 battery at all. In essence, my Leica M8 charging unit will charge my camera battery if I use the auto cigarette adapter. It will not charge if I do not use the car adapter and just plug it in a regular home electrical outlet. On Amazon, I just bought an adapter that will let me use the car adapter plug in my house , a universal AC to DC converter ($3-$10 fix). I figure, this is not a waste of money in that I can charge other devices that would normally plug in a car lighter socket, and use it with my M8 charger too. I will probably get a second charger as well later this year (TAXES,$$$, etc,,,) when it is in my budget. I think the weak point of this charger is the area where the plugs change in the back. I have had other adapters for various devices over the years, many of them being thrown about. None if any have ever quit like this one. I love Leica lenses and cameras, but their electronic devices can be touchy at times!