Talktime

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Talktime is usually measured in hours for any rechargable communications device (mobile phone or cordless phone).

This is the maximum expected duration a fully charged battery is expected to last under perfect conditions (ambient temperature has a major impact on battery life).

A safe rule of thumb is to use the following guide to expected talktimes as your phone battery ages (the last column has a specific example of 12 hours talktime):

Age	fraction of max	percentage est.	talktime
< 1 year	3/4th	75 - 85%	9 - 10 hours
1 - 2 yrs	2/3rd	66 - 75%	8 - 9 hrs
2 - 3 yr	1/2	50 - 66%	6 - 8 hr
3 - 4 y	1/3rd	33 - 50%	4 - 6 h
> 4	1/4th	25 - 33%	3 - 4

Most phone batteries don't last more than 4-5 years and have to be replaced by then.

Talktime is different from the standby time of the device, which is always much longer.