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You don't even get what "Big Mike's" promises with these batteries.
on July 26, 2013
The batteries last about 1/3 the amount as the original Canon battery. I guess you get what you pay for.
Shortly after posting this review, a rep from Big Mike's, the only seller of this item, called me to ask me to remove this review. I told him that I have no intention of doing so since it is my honest experience with this product. He then said he would replace the batteries with better ones (from Vivitar) and include a return shipping label for me to return these seemingly defective batteries (so he could have them tested), which he did after about a week. The new batteries from Vivitar work very well. He then called about a week after that and said that his tests confirmed my findings of low capacity and that he then called the manufacturer that told him that these batteries were NOT meant to be charged in the OEM Canon charger, otherwise they may not fully charge. They are meant to be charged in a generic charger that does not require a special component inside the battery that communicates with the Canon charger (which apparently the Vivitar batteries posses since they charge fully). He then asked me to once again remove my review. I again told him that I would not remove it but that I would update it and I also recommended that he specify very clearly in the product description that these batteries are NOT OEM replacements as they do not contain the component needed to be fully charged by the OEM Canon charger and that they require a generic charger in order to charge fully. He said he would do so immediately. That conversation was days ago and Big Mike's has not yet amended the product description to reflect this.
Normally I do not divulge this much about a seller in a review but since this is the only seller that sells this item, I feel it's pertinent.
If anyone sees that they have actually changed the description as promised, please let me know and I will adjust this review. Thanks.