What will happen if the batteries with different capacity are packed together?

What will happen if the batteries with different capacity are packed together?
>If the batteries with different capacity or new and old batteries are used together, leakage, zero voltage and so on might happen. If the battery are rechargeable and are being charged, some batteries is overcharged and other batteries is not in full charged state. During the discharge, some batteries can not discharge fully and other batteries might over discharge. This way, the battery will be damaged.