I’ve finally received it few days ago and tested it heavily for this time. Results are promising and I’m already sure it’s good piece of hardware that I can easily recommend to anyone (not only N900 users). But first things first…

You can easily buy (or check it’s detailed specifications) Proporta USB TurboCharger 3400 or other N900 charger (detailed specification available here) and it should be shipped quite fast (I was surprised that even recent volcano eruption haven’t issued delivery time).

Boxed Proporta USB TurboCharger 3400

After unboxing you get the charger itself and small sack with retractable USB cable, manual, various plugs, from which USB micro and mini are the most important and enough place to put charger itself. Everything looks pretty elegant, black box a bit smaller than N900, with  USB A socket for power input, USB mini socket for power output, one button and five blue LEDs to indicate current capacity. Out of the box it’s charget to about 70%, but I wanted to check it’s full potential. Charging is simple, just use the cable and USB mini plug with any USB port (i.e. in your computer).

Testing day 1

In the morning N900 and charger are fully charged, I started draining battery by using device a bit more than every day, this way in the evening I was getting ‘Battery low’ notification. I’ve connected charger to N900 using the same cable and USB micro plug. Charging speed is approximately the same as from computer, so I left it connected for the night and went asleep.

Testing day 2

Next day started with fully charged N900 and more than half of full capacity in charger. Again I was using device in power-draining way and around evening ‘Battery low’ showed up again. This time I connected charger and plugged N900 to TV to watch a movie. After approximately 1.5 hours movie ended, charging continued and I left it this way. When charger finally indicated that it’s empty N900 battery was charged to about 85-90% of full capacity.

Conclusion

This charger allows to extend time using N900 approximately 3 times! I think that from today it will be regular part of my everyday equipment and I recommend it to any mobile phone user. You can get yours here.