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These are Arris BPB044S 8.4vdc 4400mAh Modem Battery Packs. They typically contain 4 of the following cells,
Modem packs are great for harvesting 18650 cells as they typically have very low cycles, and sometimes they even have zero cycles. To harvest the cells you have to crack packs open and extract the cells, you'll have to cut and clean the Nickel interconnects using snips.
Once the Cells are out and clean you will have to test them using a charger like this.
Typical Capacity: 4400mAh
Nominal Capcity: 4300mAh
Voltage nominal: 3.6V
Charge voltage cut-off: 4.2V
Discharging cut-off: 2.5V
The pack has 2x 2200mAh cells in parallel, so the pack is 4400mAh.