The reason why 9V batteries are much bigger in their physical appearance than their AA or AAA counterparts is because of the fact that 9V batteries have to supply a greater current rate of electricity than the aforementioned batteries.
there are 5ft 2 in height no bigger than 5ft 3.
they are bigger
No, there are only atoms, electrons and chemicals in a battery. And there are many of these types of things in bigger batteries.
batteries in a car is bigger and cause exploions and flash light dont they bring light to the flashligt
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They use batteries quite similar to car batteries. Sealed lead-acid batteries. They are huge. Bigger or smaller subs will of course have different sizes and amounts. Batteries produce waste gas and hydrogen when charged or discharged and must also be ventilated regularly to prevent build-up.
Because they're small. If you had 4 AA batteries, it needs to be bigger.
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Other things being equal - same material, mainly - a bigger battery will store more energy than a smaller battery. If the same amount of power is used, the bigger battery will last longer. Whether this is better or not depends on the specific needs - the bigger battery will also be heavier, and use up more space.
Exercise and physical activity
Just a little under an hour for 1100mAh-2200mAh batteries but probably 2 hours and up for bigger batteries. I charged 2 1600mAh batteries (1 being 8.4v an the other being a 9.6v) in under 2 hours.
physical hardware limitation