Battery Size In A Jump Starter Pack

[d2dave]

Can any one tell me if there is a way to know how many true amp hours are in a portable jump starter.

I know this will vary depending on its size.

I have a son coming back from USA and the unit that I want says 2000A peak 20000mAh

Now to me this is gobberlygook. To travel with it on a plane a lithium battery has to be under 100 watt.

How do I or airport authorities calculate this?

This is the unit Robot or human? (https://www.walmart.com/ip/Audew-Portable-2000A-Peak-20000mAh-Auto-Battery-Jump-Starter-for-All-Gas-Engines-or-Up-To-8-5L-Diesel-Engines/414864757?athbdg=L1700)

[Vern]

Can any one tell me if there is a way to know how many true amp hours are in a portable jump starter.

I know this will vary depending on its size.

I have a son coming back from USA and the unit that I want says 2000A peak 20000mAh

Now to me this is gobberlygook. To travel with it on a plane a lithium battery has to be under 100 watt.

How do I or airport authorities calculate this?

This is the unit Robot or human? (https://www.walmart.com/ip/Audew-Portable-2000A-Peak-20000mAh-Auto-Battery-Jump-Starter-for-All-Gas-Engines-or-Up-To-8-5L-Diesel-Engines/414864757?athbdg=L1700)20000ma = 20A
20A x 12v = 240watts

[d2dave]

20000ma = 20A
20A x 12v = 240watts

Thanks Vern. I understand ohms law. What I do have trouble with is that such a small device could have a 20 ah battery.

This being the case I could run my 40 litre Engel for about 13 hours off this.

[BradC]

They don't. They have a total of 20AH @ a nominal 3.7V. That gets divided by 4 to get a nominal 14.8v (peak of 16.8 but it'll put a float on the car battery sharpish). So realistically 5AH, but then that's also Chinese Amp Hours, or 5AH PMPO.

My power bank here is 26800mAH and the label says 99.16WH.

[101RRS]

Why import one when they are cheap as chips here - mine off ebay was a little less than $100.

[BradC]

Can any one tell me if there is a way to know how many true amp hours are in a portable jump starter.

How do I or airport authorities calculate this?

This is the unit Robot or human? (https://www.walmart.com/ip/Audew-Portable-2000A-Peak-20000mAh-Auto-Battery-Jump-Starter-for-All-Gas-Engines-or-Up-To-8-5L-Diesel-Engines/414864757?athbdg=L1700)

Right there on the specifications page: Capacity: 20000mAh (73.2Wh)
So they've used a nominal voltage of 3.66V

The way to know how many "true" amp hours are in the device is to do a couple of calculated discharge tests. I have a specific rig built to do that with a controllable load, a couple of GPIB volt meters and a calibrated shunt. But that's probably a bit more than you need.

[d2dave]

Why import one when they are cheap as chips here - mine off ebay was a little less than $100.

From my research it appears to be a really good brand and freight is free, so no much over a $100

[W&KO]

From my research it appears to be a really good brand and freight is free, so no much over a $100

Make he doh me checks he can carry in checked in luggage [emoji3466]