Buying used camera battery. How old is too old?

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Max5150 Regular Member • Posts: 265
Buying used camera battery. How old is too old?

I need to buy a few spare Li-on batteries for my cameras. B&H has a few used ones that are a lot cheaper than new. I was under the impression Li-on batteries lose capacity as they age. Going by the date on the battery, how old is too old? Also, is there any way to test the % of remaining capacity? My phone shows "battery health" by showing the percentage of capacity remaining.

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