Features:

• Rechargeable digital camera battery
• Designed to be compatible with the same models as the Canon BP-511
• Lithium-ion chemistry
• 1200 mAh capacity
• 7.4 volts

Editor Reviews:

Product Description:
UltraLast Rechargeable Digital Camera batteries are designed to deliver long lasting technology for more shots per charge. UltraLast extensive line of digital camera batteries has a battery fit for almost every major brand and model of digital camera on the market. Every UltraLast Digital Camera battery is guaranteed to perform equal to or better than the OEM equivalent battery.

Rating : - Would have been 4 stars but it doesnt last as long
I bought the battery as a backup for my 10and30ds. I'll keep this short

Pros:
quick charge, works well, perfect fit, CHEAP!!!!!

Cons:
battery goes faster than other batteries. It gets through a 2hour shoot just fine. But by the time your done.. so is the battery:) Looking @ it i think it's bc the battery is rated @ 7.2V. The official canon battery is rated @ 7.4V. That things lasts forever! :)

results:

I'd recomend it as a spare battery. I'd even get another one just for that purpose. The price more than justifies the battery life for me. I just keep my chargers close :)

I hope this helps