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

• Recharge Basic Charger charges 2 or 4 AA/AAA NiMH rechargeable batteries

• Includes 2 AA Energizer NiMH batteries with 1300 mAh charge capacity, pre-charged and ready to use

• Approximate charge time of 7-13 hours for 2 or 4 batteries

• Compact wall outlet charger with folding plug for easy storage

• Charges batteries 100s of times for an economical and responsible way to keep all your electronic devices powered and ready to go