Mmm, why 4 contacts when the battery but only 3 has

and, moreover, in false intervals, so that only two contacts fit together? My reason for buying was the extra car adapter, which was a highlight for me, there has to be repeatedly counted left powerless if you give only the car as a source of energy available. Otherwise I use the original charger by Canon, but only works on the electricity grid.
With the two mitbestellten mtb batteries NB-5L for my Canon PowerShot 200 IS, I then made a charge equal to test.
The charging cradle is actually too large for the battery, so you should make the insertion carefully to really bring the two spring contacts, which are intended to make the charging of the battery boxes, in conjunction with the metal surfaces. The average contact area of ​​the battery goes, unlike the original charger, empty-handed. What are the two right-hand contact springs, is not apparent.
The pilot light of the charging appliance displays green, that the device is plugged into the mains. No info about loading operation or charging status of the inserted batteries.
After 4 hours of charging time (the original charger requires scarce 2 1/2 hours to fully charge a original batteries) I have the battery in each case removed and again placed in the document loader, which then again almost an hour boosted the mtb battery before taking the set of red (charging) to green (Ready) jumped round. Well, the prices are very moderate. As the battery behavior in terms of total number of accessible recordings and the service life I will try in the next few days ...
Same text for charger of mr! Tech and battery-double of MRI.