This video show what happen if lithium battery parallel connection
If one battery low and the other battery have full charge.

One high voltage battery can tranfer energy to the other battery.
Note Lithium battery very danger, make sure you understand with this battery.

Depend of capacity low and high battery during tranfer power in parallel connection

Good
If battery pack with the same brand, capacity. Make all battery low resistance and give more power

Bad
If you mix, one weak cell, different capacity cell.
During charger, one cell will get very high voltage charging. Specially low battery, or bad battery.
Because charger only detect full charge 4.2V/DC
In parallel battery, total voltage is total output batteries in parallel connection.
One battery already full charge 4.2V still get charging. During the low voltage battery increase voltage.

Can you mix batteries with different ah?
No, you can't connect batteries of different Ah in series with a good result. However you can connect batteries of different Ah in parallel using diodes. As stated already you should only connect batteries of same type/age/brand in series.

What happens if you connect batteries in parallel?
When you connect two identical batteries in parallel, you double the output capacity while keep the output voltage the same as either battery. In the other case, if two identical batteries are connected in series, the output voltage is doubled but the output capacity is kept the same as either battery

With parallel cells, capacity in Ah and runtime increases while the voltage stays the same.
A cell that develops high resistance or opens is less critical in a parallel circuit than in a series configuration, but a failing cell will reduce the total load capability. It’s like an engine only firing on three cylinders instead of on all four. An electrical short, on the other hand, is more serious as the faulty cell drains energy from the other cells, causing a fire hazard. Most so-called electrical shorts are mild and manifest themselves as elevated self-discharge.

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