need GCp battery help

atarihacker · Post by **atarihacker** » Fri Jul 25, 2008 6:06 pm

hi I need some help figuring out
how long would a game cube and a intec game cube screen last on a 12v 4200mAh ni-mh battery
I don`t know how to caculate it
thanks
A.H

Post by **bicostp** » Fri Jul 25, 2008 6:17 pm

It depends on a lot of factors (mainly the voltages the battery gives out at any given time and the voltage where the system flakes out and restarts), but the basic estimate formula is:

Battery Capacity / Total power draw = Battery life

So a 3500 mAh battery powering a device with a 1 amp draw at the battery's voltage will go for about 3 and a half hours. (3500 / 1000 = 3.5)

I don't know the power draw for the Gamecube or Intec screen (look it up yourself, lazy

), but I'm guessing about 1200mA for the GC and 500mA for the screen, a total of 1700mA. Given your 4200mAh battery...

4200 / 1700 = 2.47058824 hours

In a perfect world, this scenario would run for about 2 hours, 45 minutes. Realistically, however, you can expect somewhere between 2:15 and 2:30.

There's also a less mathematic approach: Hook everything up to the (fully charged) battery, turn it on, and see how long it lasts. (Or ask someone who's already made a GCP.)

EDIT: Better?

grossaffe · Post by **grossaffe** » Fri Jul 25, 2008 6:35 pm

bicostp wrote:There's also a less scientific approach: Hook everything up to the (fully charged) battery, turn it on, and see how long it lasts. (Or ask someone who's already made a GCP.)

Not to be knit-picky... but wouldn't that be the MORE scientific approach? you know, experimentation? the other way would be the more mathematical approach.

Website · Post by **Life of Brian** » Fri Jul 25, 2008 9:31 pm

I'm glad you put your nerd glasses on for that one, grossaffe