Re: My battery is 'flat' ?
I guess it's all a matter of colloquial usage: my Stateside colleagues would say their car wouldn't start because its battery was "dead", not flat. "A flat" to them is a flat tyre (tire!).
"Discharged" is the expression I'd expect to find used in any more-technical discussions about batteries though: my APC UPS-monitoring software talks about 'charge' 'discharge' etc, and says "the unit will signal via the control-interface and a continuous tone on the audible alarm when the battery is 90% discharged".
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