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Been experimenting, soldered in an XT60šŸ¤­

Shawn

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I have just tested a Zippy 2200 that I bought 3 years ago and used once. I put it away with a storage charge. From 100% down to 20% hovering in my living room it lasted 15minutes 40 seconds.
Just ordered some Panasonic 3400mAh 18650's. 3 came in at just under Ā£20 and I have all the other stuff already. I should be able to make a 3S battery for it coming in at around 200g. Standard POWER battery I have is 217g.
Will keep you postedšŸ‘
 

Shawn

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Built the 3400mAh Panasonic Li-ion battery and first flight was not good.
My charger reported putting in 2700mAh.
Same as with the 2200 living room hover.
100%-20%= 8 minutesšŸ˜³
100%-3% because they can safely go down to 2.5v and it did 14minutes.
I weighed the cells as soon as they arrived to check they were genuine and they are the right weight.šŸ¤”I thought I would get 25mins as YT vids would suggest. Will charge them and try again may need bedding in. Get some shrink wrap on as well.
 

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Shawn

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Just tested a single cell. Put it through a discharge cycle to take it down to 3volts.
Then charged it at 2amps. Took 2981mAh. Which sounds low but I think they work it out from 2.5v not 3všŸ¤”
 

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Shawn

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I forget offhand what the cutoff voltage is for the original batteries, I think it is either 3.0 or 3.3 volts.

Mike
Just flown it to a forced landing and tested it immediately and it was 3.57v a cell but there is probably some bounce back there with the load removed.
 

Shawn

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Flown again and although not great, percentage wise it is quite an increase.
100%-20%=11mins30secs
100%-forced landing=17mins
 

Shawn

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Just carried out a weight test,hover above the bed. Only the Zippy for power and the Panasonic for extra weight(322g total). Really heavy in the hand and I did not think it would work BUT it did.šŸ˜³
Found a 4000mAh battery for less than Ā£20 so think I will give that a try now I know it can take its 305g.
For reference the Gifi4000 is said to be 260g(Amazon stat)
and my POWER battery is 217g
EDIT: Just a minute though,the zippy is 158g so 2 of them would be 316g and 4400mAhšŸ¤” plus if it did not work in the field I would still have 2 usable batteriesšŸ˜
 

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Shawn

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Just tested the Panasonic 18650 pack again and its a bust for me,failure!
I put each individual cell on a discharge cycle yesterday and took them down to 3volts each. Then balanced charged them to 4.2v. After standing overnight I have just living room hover tested them again and....
97%-20%=9mins30secs
97%-2%=13mins30secs.
So I am not going to go for a massive battery that will give the Bebop a hard life I am going to get some 2200. Ā£15 each and probably 20mins to 5%. Will test my Zippy 2200 down to 5% and report back.
 

Shawn

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Zippy 2200mAh 25C straight from the charger:
100%-5%=19mins
final cell voltage 3.57
 

Shawn

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Original 3 year old with only a 2hr total flight time POWER battery. 11.4v 3350mAh perfectly ballanced at 4.2v because thats what they are(fake)from the manufacturer.
100%-5%=19mins30secs.
 

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