A quick documentary of my FPV flight to Robben Island, where Mr Nelson Mandela was imprisoned for 18 years.
Back then I was very worried about flying over water...
This was before Cruize mode :)
About 16km and 35 minutes, safe touch down!
You need to be a member of diydrones to add comments!
Comments
brilliant stuff!!!!!
The key is the smaller battery will never deplete. It will maintain the same voltage as the rest of the system, just contribute to the power delivery. As long as it can maintain the discharge rate.
I've done quite a bit of research asking experts at rcgroups and it makes sense and works perfectly in practice.
The reason for the specific combination is I estimated I need as much mah with safety margin. I didn't need 10ah.
Matthew is correct, although unmatched battery configurations will work to a point you do run the risk of damaging the lower capacity pack if you draw more than twice the lesser packs capacity. Think about it, why do you only see packs made up of individually matched cells? In the case of a normal 3S LiPo you have 3 3.7v cells, if they weren't matched say 2200mAh each but instead 2200,2200,1800 then when you consumed more than 1800mAh you would see a dramatic drop in voltage and possibly ruin the cell.
Your unmatched parallel configuration will work as long as the actual current demand on each pack is equal and you don't exceed twice the capacity of the smaller pack. As a side note C ratings will play a role here as well, if you have two packs with different capacities, but the same C rating, you will draw more current from the pack with the greater capacity than the one with the smaller capacity. Finally if the current demand exceeds the C rating of the smaller capacity pack you will see swelling and possible damage to the smaller capacity pack, while the larger capacity pack will remained unharmed.
The short answer is you may get away with it for a while, but eventually the smaller capacity pack will either begin to show signs of reduced performance or will be permanently damaged.
Regards,
Nathaniel ~KD2DEY
I agree with Hein, I think it's... a strange thing to do, but technically it should work.
Another awesome video. Hmm Imagine Seal Island in False Bay (Great white shark hangout)
Here in the Garden Route Mossel Bay area - local seal island is 500m offshore from Diaz beach
another favorite Great White Shark hangout
@Morli - It's the international legal rigmarole which just seem to take years. Only winners are lawyers.
@Francois - 1) I'm using Lawmate. It's out on the wing tip, very far away from the GPS. I had 14 Satellites the other day ! Weird. 2) No, as long as you don't draw more C than any of your batteries in parallel can handle and they all start out with more or less the same voltage, you're fine. I've checked cells after each flight and through both the 5000 and 2200 they're exactly the same voltage. I'm keen to try my new 8000mah + 5000mah ...
Very sad day indeed for us all. Tanks for all the comments!
-
1
-
2
of 2 Next