I wanted for my various batteries (various, sometimes "old" digital cameras, SLR and mobile phones, as well as AA and AAA batteries) is an affordable second charger for vacation and work, serving everything and as compact as possible.
The Multi Charger has been loaded everything smoothly and was relatively fixed, "felt" even faster than the original chargers.
Setting the contacts is sometimes pfriemelig and requires some patience, but you can apparently also nothing "reverse polarity". If the Contcs produced the charging indicator blinks until it has the correct charging current found, and then get started.
At the end of charging all 4 bars are displayed constantly.
AA batteries can be loaded as well, but need to be properly positioned so that they make contact.
A car charger is attending, but the batteries are expected due to the weak "clamping" relatively easy to lose contact in the device while driving. The Simple version of DigiChargers (without "Pro") has significantly stronger springs and is likely to cope better, it is necessary to clamp the battery there edgewise while she in DigiCharger Pro "insert" can.
My first unit of mobile energy was broken, here was not working, the height adjustment of the charging contacts. A quick call and 2 days later I had a replacement device plus 2 batteries as compensation. That's what I call service!