PHOTOS: JAMES SMITH
Bill Culbertson just at take off (above) with his MiG-15UTI with Derrick Martin in the back seat. Which met with the approval of the crowd (at right).
makes and labels Giant Power and Dinogy packs with different labels) mentions on their website: “Radio Controlled Shop Ire- land have been doing research for many years in order to find the best LiPo batteries untill (sic) now. We are now buying our Li- Pos direct in the LNE factory.” They then go on to discuss how they are rating in the testing thread mentioning: “It’s a big thread on RC Groups but well worth the read”, and that cell life and cost-per- flight must be considered (not just the packs cost) showing a screen shot of the charge/ balance cycles for a fellow flying a helicopter and state: “Giant Power LiPo batteries are guaranteed for 200 cycles plus with a 6-
month warranty. They are built with fresh cells as per order with matched IR and volt- age per cell.”
Disclaimer: I do not own any Dinogy/ Giant Power cells, and even though they are in the top three rated brands, I need to ap- plaud them in that they are paying atten- tion to the forums from around the world and the number of disgruntled pack-killers among us and providing a stated warranty that is actually real.
Additionally, as you scroll down their home page (
http://tinyurl.com/keehxyg) you will find a video on how LiPo cells are made, comparison discharge graphs and diagrams of their cell tabs and “other’s” cell tabs—
4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3
yeh, skepticism is needed, but there is still a lot of information here. However, the fact that jumped out at me was a comparison of cell discharges at 35 amps. Perhaps that is realistic for a helicopter flyer, but not for those of us into EDFs, therefore the need for testing like our “short” 109-paged one! Since I do need to allow room for the pho- tos in a larger than postage stamp size, I’ll wind up with several graphs and finish with the way the testing is going next month. I do need to reiterate the words from Giant Power/Dinogy’s website: the thread is well worth your time! That’s it for this time around, so until next time: fly safe, and trust in thrust!
Data Update Rate: 500ms Elapsed Time in Seconds Pack Cell Volts
Lowest Voltage Is Cell 1 at 3.276
5 10 15 20 25 30 35 40 45 50 55 60 65 PHOTOS: GREG MOORE
This is what happens to a 12S 5000mAh, 60C ThunderPower pack at a real 30S (150 amps). The small wire and minimal solder joint (above left) began melting the shrink wrap and the resultant soft joint was easily pulled apart with Joe Giamona’s fingers. What a bad pack discharge looks like (above right). Notice the differences in the cell voltages where one cell has in effect fallen out.
3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1
Cell Voltage Pack “B” Lowest Voltage Is Cell 3 at 3.744
This Nano A-Spec 12S 5000mAh, 65C pack (below left) is about as close to “perfect” as one can graph in this 20C discharge. Notice how all the cells almost overlay each other on the graph and are holding at better than 3.7 volts. The same pack (below right) showing the consistent voltage and extremely small temperature rise. These two graphs are what all cells discharges should look like.
70 75 85 80
Data Update Rate: 500ms Elapsed Time in Seconds 5
10 15 20 25 30 35 40
45
50
55 60
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