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What i understand that how much percentage is how long you used the service.if you on your display to sms, browsing, display percentage will be higher.regardless you set the brightness to highest or lowest.do correct me if I'm wrong

The battery usage graph/bar is based on percentage. If you use your phone then normally the display will be sitting on the top (highest percentage). If you just leave you phone idle for a long time then your Android system and phone idle time will be at the top. There's nothing to be worried if your display sitting on the top.
Touch the display bar and see how long is your total screen on time.?

I have, Spider-Foot (same type as dealextreme/obostore). Advertised capacity is an OUTRIGHT LIE, true capacity is about 2400mah. The old ones are okay, new ones have shit capacity (2100mah). Most seem prone to losing max capacity over long term use. They ARE CHEAP though.

Dunno about Mugen, but from initial experiments over at XDA, their 3500mah batts seem to ONLY hold about 2400-2600mah as well (for RM300). They might last longer without losing max cap though.

Better stick to Momax 2700mah (true capacity 2680mah) or ori Samsung 2000mah. I have both and recommend the Momax ONLY if you can stand the bulging, cheap plastic back. But battery performance is outstanding and it's considerably cheaper then the Samsung ori too, if you can buy from ebay.