Yeah,
It would be better if there where percentages instead of bars!
I asked a friend who has a 3650 and he said that the bars aren't really accurate. He said just pay attention to two specific bars: One the tope full charged bar and the other the last bottom bar! The other bars are nothing to count on!
And something else: I've experienced that rebooting or turning on/off your 6600 consumes a lot of battery power! Which in my case I imagine I teurned the handset on and off a couple of times.
But about the pic messages: They're not something that would take half of you battery! (They were ordinary picture msgs.)
Anyway, I went to the store and told them that this is a faulty battery, and since I became friends with the guy previously upon purchase (Just goes to prove friendship is Great!), he exchanged the Chinese battery with a Hungarian BL-C5. Just have to see how this battery goes!
So overall the following would be a good result for those guys having the same problem as me:
1. Don't turn on/off your handset, unless you have to, because the startup takes a lot of power
2. The chinese batteries seem to be not that good comparing to the others (the battery charge time is less than the Japanese and Hungarian)
3. 6600 appears to have a high power consumption level (Nothing u can do about it!)
4. Regarding that the 6600 has a TFT screen, I'd imagine that itself would take up a lot of power
5. Don't use screensavers and Powerlock if you're worried about battery consumption like me!
6. Poor reception also has an effect on you battery consumption!
7. Always buy original Nokia enhancements, mine was original but just in case you're thinking of buying those batteris that cost 1/4 of the original battery price (I recall Nokia DiamondPlus or something like that, but it had diamond in it), don't do it, because it's not worth buying them, they will have a shorter life than the original.
8. Remember to turn your BlueTooth off when not in use
9. Turning down the brightness might be useful also!
10. Don't over-charge the battery, because overcharging will reduce your overall battery life!
11. Let the battery get decharged once in a while to restore the battery life. It's a new technology in Sony Battery chargers which they have a Refresh button, and when you press it, all batteries will first get completely decharged and then they get charged. As they say, this can restore the battery life up-to 97%
Hope this solves the problem of other guys who are having the same problem that I had! 😉