According to Correctional Service Canada National List of Personal Property for Men Inmates can have 8 - Batteries (rechargeable and charger).

Charges 2 or 4 AA or AAA NiMH rechargeable batteries at once (4 AA batteries included)

• State of the art Charge Status Indicator system visually and audibly alerts on your batterie's charge levels

• Get a full charge in 4 hours with the rapid charging power of Recharge Pro (times may vary by NiMH battery)

• Auto safety shut off and overcharge protection features prevent damage from overcharging, helping to maximize battery life

• Built in, fold out plug design allows you to easily store the Pro Charger Battery Charger when not in use

• Compatible with all AAA and AA NiMH rechargeable batteries (Energizer Recharge batteries recomillimeterended)