My mobile phones lithium-ion(Li-ion)battery has a capacity of 970mAh?

my mobile phones lithium-ion(Li-ion)battery has a capacity of 970mAh. The battery can be used for 4 hours talktime or for 9 days on standby.


Approx how much current does the mobile phone draw during talktime and when on standby(Rounded to 1 decimal place)


Am stuck on this question.???

My mobile phones lithium-ion(Li-ion)battery has a capacity of 970mAh?
The "mAh" is the standard unit of storage capacity for a cell. It is similar to "gallons of fuel" for an internal combustion engine. The "mAh" rating of a cell tells how many constant milli-amps of current can be supplied by the pack for one hour. This rating can be used to find the duration that a battery pack can provide given a certain draw. Because cells are wired in series, the "mAh" rating of a pack is the same as the "mAh" rating of a single cell





How long a battery lasts depends on a) how much current (measured in milliamps) you draw from it and b) the amount of charge (measured in milliamp-hours) it has. A milliamp-hour is the amount of charge that is removed after drawing 1 milliamp of current for 1 hour.----So, for example, if a battery has 500 milliamp-hours, you could draw a current of 20 milliamps for 25 hours, or a current of .5 amps for one hour, or one amp for half an hour.





So for your phone you could withdraw 970 mA for 1 hour or


970 mA /4 = 242.5 mA over 4 hours





(970 mA) / (9 days x 24 hours/day) = 4.5 mA over 9 days
Reply:Well, because of the way that mobile phones work, it draws more current when you are talking because the phone has to amplify the signal from the built in antenna as long as you continue to speak.





The phone manufacturer claims that you can talk for 4 hours but this will be an approximation and you may be able to talk for longer than this depending on the state of charge on the battery.





Going with the manufacturer's specification, The maximum capacity on the battery is 970mA per hour.





If the phone is rated for 4 hours talking before the battery goes flat, the actual current use is





970mAh/4h = 242.5mA per hour.





Since on standby, the phone only has to periodically link to a relay station to make sure it is kept in the phone system, it uses far less current.





If the phone is rated for 9 days standby before the battery goes flat, the actual current use is





970mAh / (9 x 24h) = 4.49mA per hour.
Reply:970 /4 = 242 mA talk





970 /(9x24hrs) = 4.49 mA standby