Maximal Power Replacement Battery Grip for Canon Eos Rebel XSI 450D/500D/1000D (Black) Amazon.com is the only authorized dealer selling MaximalPower brand products. Please make sure your item is ONLY sold and shipped by Amazon.com! All other marketplace vendors are selling counterfeit products that do not perform the same, and/or are not covered by our MaximalPower Warranty With IR, within 10meters 100% OEM compatible. Guaranteed to meet or exceed original specifications. 1 Years Manufacturer Warranty. More comfortable vertical shooting 1 Year Manufacturer Warranty.