Title: Worth the money
Review: Before you buy a generic battery pack, first consider how many times you'll want to use it before it becomes useless. The generic battery I bought doesn't hold much of a charge after a dozen uses. Also, double check the voltage and capacity (mAh) of the generic, often times they're cheaper because they're underpowered and have less capacity. For my money, the reliability of the Canon BP511A is well worth the premium (I've been using the original for over a year now).
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