Perhaps you are using a different battery type. Zinc carbon will perform otherwise compared to alkaline, for example.

Yes, Ni-MH rechargeable batteries can be used for (torch) lights with a wire filament.

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Whereas some heat is normal, unusually hot batteries could be caused by over-discharging or short-circuiting. In such case, remove them from the device immediately.

Battery performance greatly depends on the device and on the conditions.

In general it’s best to never let your batteries deplete completely. Try to recharge them before the energy level drops below 30%.

Whereas some size change is perfectly normal, it should not be overly pronounced. If so, replace the battery immediately. A bulging coin battery may lead to device malfunction and even short-circuiting.

Always remove batteries from devices you don’t use for longer periods, from devices connected to AC power and when batteries are empty.

Panasonic zinc air batteries have been specifically designed for hearing aids, other batteries may not perform as well.

Any minor difference in the batteries will cause either batteries to overcompensate and to deplete faster.