Theoretically, 12v100ah batteries and 12v50ah batteries can be mixed under certain conditions, but this practice is not common and is not recommended, mainly for the following reasons:
1.*Capacity mismatch**: The capacity of the two batteries is different, the capacity of the 12V100Ah battery is twice that of the 12V50Ah battery. When connected in parallel, although they are equal in voltage, the current will be distributed according to the proportion of capacity, resulting in undercharging or over-discharging of 12V100Ah batteries, affecting their performance and lifespan.
2.*Unbalanced charging**: When used in parallel, due to the different ages, states, and internal resistance of the two batteries, long-term use may lead to uneven charging, which further affects the performance and life of the battery.
3.*Temperature Differences**: Larger batteries typically have higher self-discharge rates and temperature rises, which can affect the performance and safety of smaller batteries.
4.Safety Issues: Batteries may produce gases during charging and discharging, which can cause safety issues if the system is not properly designed.
If you want to use batteries of different capacities, it is recommended to use multiple batteries of the same capacity and performance in parallel to ensure a balance of performance and life. In addition, it is recommended to consult a professional battery technician or engineer to ensure the safe and efficient operation of the battery system.
In conclusion, while it is technically possible to mix 12v100ah and 12v50ah batteries, this is not an ideal practice and can present a range of performance and safety issues. If you do need to use batteries of different capacities, it is best to seek professional advice and ensure that appropriate measures are taken to protect the integrity of the system.