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Inexpensive Option to OEM with some flaws
on January 7, 2016
This is one of those you get what you pay for type products.
First off, if you expecting an OEM battery you can spend 6x what this one costs to get those standards. I call these my back up batteries that I use first while on a shoot or out in the field.
I have 2 Canon OEM batteries which can be recharged for years, have no problem communicating, and are my reliable sources of power. Along with those 2 OEM Batteries I have 4 of these inexpensive batteries that do the job when my shooting is a little more flexible. They probably hold about 80% of the charge an OEM battery has and after a 12-18 months I expect my camera may stops communicating all together or it will no longer hold a charge. That's the nature of the game.
However, if you go into this purchase knowing that then you shouldn't be surprised if one dies on you. When you're out in the field and you need power I recommend using your OEM battery last and using these batteries first. They will more than likely give you all the charge you need for your shoot however you have the added insurance of an OEM workhorse sitting in your bag ready to go if you run out of juice. With one exception, don't rely on these batteries during a "no second chance shoot". Meaning I wouldn't have these batteries in my camera during the wedding ceremony or the start of a race, however if you are doing staged shots or won't be affected when the battery runs out of juice and you have to switch batteries then you will be fine.
Again for the price they are offering these at you can have 5-6x the power in your bag, however they do not replace the reliability of an OEM battery, so don't assume they do.