questionswhat's a good deal on a battery-based portable…


You will need to know the power consumption on your device in all modes before you can tell how long your back up power supply will last.

Battery capacity / device consumption = time

Don'f forget to convert your units.


Can you guide me through figuring that out? let's assume, for example, that I have an HP 1702 monitor. Where do I find the units of capacity and consumption? Same for my laptop. I'm confused! Sorry.


@sirlouie: It is listed in your manual under specs. Or you can go to the manufacturer's website and look it up there. Here is the spec sheet for an HP 1702 monitor -

Nominal Current 1.5 A maximum
Typical Power Consumption: 8.5 watts
Maximum < 40 watts
Power Saving < 2 watts


Okay, thank you very much. Now how do I make sense of those numbers (1.5A max, 8.5 watts / max 40 watts for the monitor, along with the battery's numbers of 22 Amp Hours (do I divide that by the 1.5A? Is that per hour?) and 400 watts? Does it seem then that I could run it for at least 10 hours? Because 400 watts / 40 watts = 10, and 22 / 1.5 = 14 ... which is right?

I appreciate your help so far. Feel free to stop if I get too annoying.