Quick Question About mAh

[xunil]

Okay, I'm trying to figure out this mAh to Ah thing.  I am trying to figure out how long a 10,000 mAh battery will support a 2.0A power draw.  Both of these devices are at 5v.  My understanding is that 10,000 mAh = 10 Ah.  This means that 10 Ah/2.0A= 5 hours.  Therefore the battery will support the device running at 2.0 amps for around 5 hours.  Did I do this right?  Or did I do it completely incorrect?

[SeanAngelo]

Okay, I'm trying to figure out this mAh to Ah thing.  I am trying to figure out how long a 10,000 mAh battery will support a 2.0A power draw.  Both of these devices are at 5v.  My understanding is that 10,000 mAh = 10 Ah.  This means that 10 Ah/2.0A= 5 hours.  Therefore the battery will support the device running at 2.0 amps for around 5 hours.  Did I do this right?  Or did I do it completely incorrect?

yes, you are right. it will last you roughly around 5 hours

[gilm0re3]

I can tell you right off the bat that even if you have the theoretically correct answer, heat is a pain. If specifically you are curious about the charge time that you could get out of a battery bank, I know that they are usually 80 percent efficient in the amount of usable power you get out of them.

[Samfisher]

Okay, I'm trying to figure out this mAh to Ah thing.  I am trying to figure out how long a 10,000 mAh battery will support a 2.0A power draw.  Both of these devices are at 5v.  My understanding is that 10,000 mAh = 10 Ah.  This means that 10 Ah/2.0A= 5 hours.  Therefore the battery will support the device running at 2.0 amps for around 5 hours.  Did I do this right?  Or did I do it completely incorrect?

One thing to note is that devices rarely ever takes 2amps all the time, and only during very low power levels.  As the battery fills up, it takes less and less amps from the charger.

[xunil]

One thing to note is that devices rarely ever takes 2amps all the time, and only during very low power levels.  As the battery fills up, it takes less and less amps from the charger.

 

Thanks so much for your guy's help.  I'm building my own laptop with these Korean Single Board Computers, and they tend to get pretty power-hungry.  This info will help me with my battery schematics.

[Stefan1024]

Okay, I'm trying to figure out this mAh to Ah thing.  I am trying to figure out how long a 10,000 mAh battery will support a 2.0A power draw.  Both of these devices are at 5v.  My understanding is that 10,000 mAh = 10 Ah.  This means that 10 Ah/2.0A= 5 hours.  Therefore the battery will support the device running at 2.0 amps for around 5 hours.  Did I do this right?  Or did I do it completely incorrect?

 

Well your calculation is only right when the voltate of the battery is the same as the load.

As your load have a voltage of 5V and a current draw of 2A you need 10 watt.

Look at the energy capacity of the battery (measured in Wh) and devide it by 10 to get the time it will last.

Factor in an additional 10-20% loss for the voltage conversation.