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RE: Math equation

Thank you.  Then 1 NP-F960 at 7.2v and 4500 mAH should run a 6w device for roughly 5.4 hours.

-----Original Message-----
From: Philip Mak [mailto:]
Sent: Tuesday, March 13, 2001 2:34 PM
To: Zachariah C Pratt
Cc: Wear-Hard
Subject: Re: Math equation

On Tue, 13 Mar 2001, Zachariah C Pratt wrote:

> How does the mathematical equation run for figuring out estimated
> battery length based on watts and amps used by pc's?  I'm trying to
> figure out how long 1 Sony NP-F960 battery should last for the Cell
> Computing PNR PII 333 with NetCard at low and high usage. For those
> out there with this rig, how long do you get out of your battery? My
> MOPS-LCD6 gets about 5.5 hours on the NP-F960 with 5 watts and an
> average of 1.65 Amps.

The power capacity of a battery is expressed in Watt hours.
The power consumption of a device is expressed in Watts.

Just divide the two to calculate the number of hours that the battery will
sustain the device. For example, a 60 Wh battery will sustain a 10 W
device for 6 hours.

Frequently, you will be given the Voltage and Current Capacity of a
battery, instead of the Power Capacity. In that case, Power = Voltage *
Current. For example, a 15 V, 3 Ah battery has 15 * 3 = 45 Wh. (Note: 1000
mAh = 1 Ah)

-Philip Mak ()

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