Some requirements and recommendations for Li-ion batteries for residential surveillance cameras with an aim for long life and capacity

Requirements:

1. Battery Type: Lithium-ion (Li-ion) batteries are known for their high energy density and long life, making them suitable for your requirements.

2. Voltage and Capacity: Select batteries with an appropriate voltage and capacity to power the surveillance cameras efficiently. The voltage should match the camera's requirements, and the capacity should be sufficient to provide power for the desired duration.

3. Cycle Life: Look for batteries with a high cycle life to ensure they can withstand multiple charge and discharge cycles over their 8-year lifespan.

4. Safety Features: Safety is critical for Li-ion batteries. Ensure the batteries have built-in protection mechanisms to prevent overcharging, over-discharging, and short circuits.

5. Operating Temperature: The batteries should be capable of operating in the temperature range expected in your residential environment.

6. Size and Form Factor: Consider the size and form factor of the batteries to ensure they can be easily integrated with the surveillance cameras or their mounting locations.

7. Certifications: Check for relevant certifications, such as UN38.3, to ensure the batteries meet safety and transportation standards.

Recommendation: Based on your requirements, I recommend looking for Li-ion batteries with the following specifications:

1. Battery Chemistry: Lithium Iron Phosphate (LiFePO4) batteries are known for their long cycle life, safety, and high-temperature tolerance, making them a good choice for your application. They may have slightly lower energy density compared to some other Li-ion chemistries, but their longevity compensates for it.

2. Voltage and Capacity: Aim for batteries with the appropriate voltage rating for your surveillance cameras. The capacity (measured in ampere-hours, Ah) will depend on the power consumption of the cameras and the desired autonomy. Calculate the energy requirements of your cameras over a 6-month period to determine the minimum capacity needed.

3. Cycle Life: Look for batteries with a cycle life of at least 2000-3000 cycles or more. The higher the cycle life, the longer the battery will last before its capacity significantly degrades.

4. Safety Features: Ensure the batteries come with built-in protection against overcharging, over-discharging, and short circuits. Additional safety certifications, such as UL or IEC, are a plus.

5. Operating Temperature: Opt for batteries that can operate within the expected temperature range of your residential environment, especially if you experience extreme temperatures.

6. Brand Reputation: Choose batteries from reputable manufacturers known for producing high-quality, reliable Li-ion batteries.

7. Warranty: A good warranty period indicates the manufacturer's confidence in their product's performance and longevity.

8. Energy Management System (EMS): Consider using an Energy Management System to optimize the battery's performance and prolong its life. An EMS can monitor the battery's health, control charging and discharging processes, and prevent potential issues.

Remember to also consider the charging system for the batteries. A reliable charging infrastructure that matches the battery specifications is essential for ensuring their longevity and performance.