In much of the world, flat is the word of choice for a battery which is nearly used up. A more correct term would be 'exhausted'. Weak, used up, run-down are all acceptable terms. 'Dead' can be vague when referring to a battery. It can mean a battery that will not accept a charge, or will not retain a charge, or a battery that is completely exhausted but would still be functional if charged.
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formal commutation is show the Accurate Information With Sophisticated Language
When would you use formal communication
It should be formal. But what do I know :)
formal is the cinema and informal is a gay man