No memory effect: 4 Pack C cells 5000mah without memory effect in our rechargeable C battery, charge your batteries at any time. Even when they are close to or partially exhausted, you won't have to worry about long-term memory effects and you'll get the full capacity for each use. Recharge:Batteries come pre-charged and can be recharged up to 1200 times Intelligent auto-sensing technology The charger can automatically detect the condition of the batteries. non-rechargeable and faulty battery detection. Package content: 4 Pack 1.2V 5000mAh high capacity Ni-MH batteries + battery cases. (The battery housing stops batteries from shorting or unwanted discharges and ensures optimal storage and protection.) Our Service: If you have any questions (whether it is product quality, usage, or other issues), please feel free to contact us and our customer service team will be happy to assist you.