Cell Phone Battery Charger for Nokia BL-4B/4CT/4S/4U/4L/5C/5B/5CT/5X/6P/6F

Pros:

Fits all kinds of nokia batteries. Easy to use - plug a power source, put the battery, LED turns red, when the battery is close to full charge, the green light in the led swithes on, when the battery is fully charged the LED lights only green.
It charged for an hour a fully charged battery (reported by the phone).

Cons:

the microUSB socket on my charger is a bit "out of phase", meaning broken, if I try to plug in a microUSB adapter, the socket will sink inside.

Other Thoughts:

Use only adapters with 5V output!
The two battery sockets are for different battery types. One fits BP-4L (and probably other with same contacts), the other one fits BL-5C, BL-4C and similar.
As I read around, you can't charge two batteries at once.

Bottomline:

Good charger for a good price, perfect if you have several spare batteries and you like to keep them charged.

Pros:

Works great! I have now charged a few of my "spare" Nokia batteries with it and it charges them to 4.22V according to my multimeter. Just a tiny bit too high. On the other hand, if the internal protection circuit has 0.02V of voltage drop, 4.22 charging voltage is to be expected and accepted.
The led changes from RED (charging) to yellow (almost done) to green during the charging process.

Cons:

It doesn't come with any cable. You'll need to provide your own microUSB cable.
It has a few other power connectors that I haven't tried yet.

Other Thoughts:

Great for charging spare nokia batteries.

Bottomline:

Get it! Together with a few spare batteries for YOUR phone from DX.