What does 12V - 4.5Ah means?

[Shahriar]

Hi
I have a Rechargable battery. Something is written on it. "12V - 4.5Ah". What does Hour ("h")means  here. Does it mean it can gives 4.5A at 12V for an hour?

ThanX in advance
Shahriar

 

[audioguru2]

Hi Shariar,
It can give 12V at 450mA for 10 hours. At 4.5A, it will waste some of its power as heat, so will last less than an hour, maybe only 45 minutes. ;D

 

[ante1]

On many lead acid batterys the discharge time is indicated like 12 V 4.5Ah/5h. This means that 5hours is the shortest discharge time in which you can expect 4.5Ah from this battery.

 

[prateeksikka]

well guys!
i dont see any reason for the mention of time  in such a case.dont u think so?
we hardly need this parameter.
;D

 

[audioguru2]

Hi Prateek,
Of course a rechargable battery should include time in its ratings. It is its capacity, or how long its charge will last for a certain load.

I think all batteries, especially disposable ones should state their A/hr rating. Instead of "super heavy duty", whatever that means. ;D 

 

[ante1]

Hi prateek,

The Ah value does not say much unless you know the discharge time! 8)

 

[John Thapa]

Can 6v 4.5AH be used inplace of 6v 10AH?
i had this battery in my samll car but it got damaged and i have only 6v 4.5 AH battery.Does it move wit h next battery

 

[Hero999]

Can 6v 4.5AH be used inplace of 6v 10AH?
i had this battery in my samll car but it got damaged and i have only 6v 4.5 AH battery.Does it move wit h next battery

Obviously a 4.5Ah battery won't hold as much charge as a 10Ah battery.

The other issue could be maximum discharge current and charge current, if it has a built-in charger.