I have just came across some battery news about Huawei U9000 model.
Mugen Power is releasing 1600mAh Extended Battery on March 9th, which is good news as it is an exceptional alternative for the original battery. Product link is here:
[HLI-U9000SL] Buy Mugen Power 1600mAh Extended Battery for Huawei Ideos U9000, Motorola Triumph
And if there are any questions do not hesitate to contact them for more information, I have purchased from Mugen several times and customer support is very friendly, totally worth a like on facebook.