Get one from ebay. They are cheap but does the job. Buy 2 just incase one breaks. If you want to go expensive way, get the OEM which comes with spare battery for around $40-$50. I have both but on ebay one, pins need to be set every time you insert the battery which is kind of pain. Also OEM charges little faster. As I said, even the cheap ebay ones will do the job.
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