It's an 8.4v Sub-C large cell pack.
The size is anywhere from 1300mAh to 4200mAh and can be either Nickel-Cadmium (Ni-Cd) technology or Nickel-Metal Hydride (Ni-MH) technology.
If the sticker on the shrink wrap is ruined, you may have to remove the shrink wrap to take a look at the physical cells, but I don't recommend that.
It could be your mysterious battery. But you should at least ask the person who you acquired it from whether the battery is Nickel-Cadmium or if it is Nickel-Metal Hydride.
Pretty much all chargers support Ni-Cd, but not all support Ni-MH. If you put a Ni-MH battery in to a Ni-Cd only charger, you will kill the battery and could potentially cause a safety hazard.
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