Then why do you plan on purchasing a replacement battery even before you got the reader?
Its battery is fairly good and will last 1 year at least (it should last longer of course).
Also before you buy a replacement I would recommend to get the reader and have a look at it and then decide whether you are good enough to replace the battery because the reader was not designed to have a replaceable battery, it means to replace it is not a trivial process.
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