Batteries Watt Hours

[djivinz]

Hi guys,

With the crazy amount of batteries lithium-ion these days (telephone, tablet, cameras,...), I want to be all square and have a doc ready in case of trouble in the airport as I want to travel with my Phantom 3.

IATA splits Lithium Batteries in 3 categories
1- <100Wh
2- In between
3- >600Wh

1: usually inside the equipment the batterie can go in checked or hand luggage. As spares, there is a limit of 20 sometimes and can only go in hand luggage.

2: same as 1 but usually the limit of spares is 2

3: forbidden unless very specific (disable chair)


So I now have a database of all batteries I am travelling with, just in case I encounter issues.

As an example, the battery of the aircraft is:
4480 MAh / 15.2V / 4.48*15.2=68Wh, category 1

For the remote controller, I cannot find the full spec, or I do not understand it, can you help?

Ok it is 6000 mAh, but online I can read "working voltage" 1.2 A @ 7.4V. What does this mean? How do I calculate the Watt Hours from this?

Thanks!

 

[N017RW]

Hello,

Here's the formula:
watt-hours = milliampere-hours × volts / 1000

6000 x 7.4 / 1000= 6 x 7.4= 44.4Wh

 

[djivinz]

So it is a 7.4V? But why it is written 1.2 A @ 7.4V while it is a 6Ah battery?

 

[N017RW]

1.2 A is the rate that the transmitter draws the energy from the battery.

So theoretically if you have a 6 amp hour battery and drain at a 1.2 amp rate it would last 5 hours (6/1.2=5)

 

[djivinz]

Thank you very much indeed for the precision!

 

[TAZ]

Hello,

Here's the formula:
watt-hours = milliampere-hours × volts / 1000

6000 x 7.4 / 1000= 6 x 7.4= 44.4Wh

Although the math is right, the numbers you provide are for the remote controller battery.

The Intelligent Flight Battery has different specs. Those are rated at 68Wh. You can find the details on page 54 of the User Manual:

 

[N017RW]

Although the math is right, the numbers you provide are for the remote controller battery.

The Intelligent Flight Battery has different specs. Those are rated at 68Wh. You can find the details on page 54 of the User Manual:
View attachment 25518

Reread the OP's post.

He said:
"For the remote controller, I cannot find the full spec, or I do not understand it, can you help?

Ok it is 6000 mAh, but online I can read "working voltage" 1.2 A @ 7.4V. What does this mean? How do I calculate the Watt Hours from this?"

 

[TAZ]

Yep. Misunderstood which item OP was asking about.

 

[N017RW]

All good.

Cheers!