It is generally not recommended to connect lithium batteries in parallel with different amp hours because doing so can result in unequal charging and discharging rates, potentially leading to damage or failure of the batteries.
When batteries are connected in parallel, they share the current load, which means that the battery with the higher amp hour capacity may discharge more slowly than the battery with the lower amp hour capacity. This can result in over-discharging of the smaller battery, which can cause damage or reduced performance.
In addition, different batteries may have different internal resistance and chemistry, which can affect their charging and discharging behavior. Connecting batteries in parallel with different amp hours may result in unequal charging rates, which can lead to overcharging of the smaller battery and undercharging of the larger battery.
To avoid these issues, it is generally recommended to use batteries with the same capacity and chemistry when connecting batteries in parallel. If it is necessary to use batteries with different capacities, it is important to carefully monitor the batteries and ensure that they are properly balanced to prevent overcharging or over-discharging.