I've ordered battery pack for 350D from them before, so would like to order others for my 40D. However, after reading some posts recently about 3rd party battery damaging the camera body, tend to be careful a bit.

The original battery from Canon for 40D is BP-511A 7.4V 1390mAh. Batteries from Sterlingtek for canon battery equivalent is BP-511A 7.2V 1800mAh & 2000mAh. I intend to order again from them, any comments on performance of their brand? Is it mindful not to get something greater than original Canon 7.4V, so 7.2V should be alright? Thanks.