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DarkButterfly:
18 Aug 2019 19:13:57
Had another negative encounter, it's been a few years since the last one, just an uneducated ******, going on about drones being illegal yada yada yada.    :-/
Still that didn't spoil my flying time, had an absolute blast  ~~
Gaza07:
07 Aug 2019 19:52:01
ooooh mrs jones  :D
hoverfly:
30 Jul 2019 15:26:34
D.B. you tightwad.. :cool:
atomiclama:
29 Jul 2019 20:14:10
DB that just means you have shed loads of props in the first place ;-)
DarkButterfly:
29 Jul 2019 18:53:33
Just had a thought, even with all the crashing I've done, I haven't bought any replacement props in over a year ~~
ched:
09 Jul 2019 19:45:42
May the sun shine and winds be light for BFU#8. Son't forget lots of vids for those of us unable to attend.  :D
Gaza07:
09 Jul 2019 18:10:30
Hope you all have a great day  :beer2:
Andy7:
09 Jul 2019 14:05:28
BFU#8 details locked in for this saturday - see the head of the forum thread for all details.
hoverfly:
05 Jul 2019 21:51:05
Good for genital warts as well......or so I'm told.. :hmm
DarkButterfly:
05 Jul 2019 21:48:24
Just fixed a busted SMA connector on my TBS unity pigtail, it suffered badly in a recent crash and split in two, nothing a touch of the soldering iron couldn't fix  :D
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Unbalanced LiPo

Started by ChrisH, Sunday,June 16, 2013, 20:26:45

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ChrisH

Hi all,

OCD taking over again (Gary...).

After an incident involving a gentle landing in an oil seed rape field after I ignored the flashing red led I decided to get some cheap alarms. Working on the principal that if I can';t see it I should be able to hear it in a similar circumstance I got 3 off ebay.

Thought I';d see how my assortment of LiPo';s measured. They give a rolling set of readings (on a 3S) of cell count, overall voltage and then individual cells. I have 4 5000 3S batteries, two Nanotech and two others. Three of them read within 0.01V across the 3 cells. One Nanotech records 3.95/4.19/4.19 on all three alarms. I put it back on the balance charger but no difference.

Question is: the fact that one cell exhibits this difference in voltage, is it on the way out or is this normal?  :hmm:
Chris
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen
 :england:

Biffa

I';ve never tested mine, but I would be a little dubious of the accuracy of these alarms.

Have you checked the battery with a multi meter?
Steve

ChrisH

Steve,

I understand that but all three showing exactly the same difference on just one battery? The other three are within 0.01 per cell.

Not checked individual cells with a meter but the overall voltage is Ok.  It';s just that it';s odd on one battery and I don';t want to risk a crash if it';s a bad one!! :hmm:
Chris
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen
 :england:

Balders

I use/rely on lipo alarms all the time.

If in any doubt, check the balance ports with a decent voltmeter, but sounds to me like you';ve got a dead/duff cell on that lipo.
Growing old is mandatory...Growing up is optional

FPV Guru
BNUC-S qualified
Sbaps.co.uk

ChrisH

Think it';s going to get sidelined.

Not risking that much kit up in the air relying on one £30+ battery that is giving slightly dodgy readings. Only had about 5 flights on that one battery. Maybe swap it for the one on the FPV screen...  ~~
Chris
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen
 :england:

Biffa

Quote from: ChrisH on Sunday,June 16, 2013, 20:46:22
Think it';s going to get sidelined.

Not risking that much kit up in the air relying on one £30+ battery that is giving slightly dodgy readings. Only had about 5 flights on that one battery. Maybe swap it for the one on the FPV screen...  ~~


Probably the best idea.

Out of curiosity I was just looking for my little alarm to see how it compared to my meter, but I can';t remember where I put it last :shrug:
Steve

ChrisH

I';m not so worried about the absolute accuracy but the fact that 3 alarms read the same on all 4 batteries raised my concern for this "high tech" battery.

Label it and use on the base station. If it fails on that nothing crashes as I use it for video alignment not full fpv! ~~
Chris
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen
 :england:

Biffa

Quote from: ChrisH on Sunday,June 16, 2013, 21:20:05
I';m not so worried about the absolute accuracy but the fact that 3 alarms read the same on all 4 batteries raised my concern for this "high tech" battery.

Label it and use on the base station. If it fails on that nothing crashes as I use it for video alignment not full fpv! ~~


The four Nano Tech Crappo Tech packs I have are all buggered. I certainly wont be buying any more.
Steve

ChrisH

Steve, expensive lessons we seem to be learning. Suckers for advertising splurge,  :angry: I';m sticking to Overlander or Zippy from now on. My oldest batteries and still good. :smiley:
Chris
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen
 :england:

Biffa

I have some Zippy';s and they are great. They have and still do take loads of abuse.

The Crappo Techs were bought after numerous recommendations - go figure :shrug:
Steve

Hands0n

Is it just the Nano Tech that are in question here? Getting a strong vibe that Zippy and Overlander are the biz.  ~~

I';ve started out with Turnigy 3S 2.2 - have three of them now, and they all seem to be pretty consistent and within only a few .0x difference from time to time. I make a point of always Balance Charging them given what I';ve read and being in no particular hurry. And then no more than 2.2amp of charge current.

--
Danny
"Its better than bad, its good"

Current FCs: Pixhawk, APM 2.6, Naza M V2, Naze32, Flip32+ CC3D, KK2.1.5
Aircraft: miniMax Hex, DJI 550 (clone) TBS Disco, 450 Firefly, 250 Pro, ZMR250, Hubsan X4, Bixler 2

ChrisH

Danny, I have two Nanotech batteries. One gives me this problem the is other fine (so far). On a percentage failure rate not good but a small sample size! Look at other posts for views on the Nanotech but lets just say I won';t be paying the premium price for them in future!  :angry:
Chris
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen
 :england:

coastersteve

I';ll be honest, my 3 X 2650 Nano Tech';s have been fantastic. They always come off cool, hold their voltage during flight and are happy being charged at 2C. My Quad pulls around 25A in hover and all my Zippy';s come off warm and my 3000A/Hr Zippy has puffed massively. All I use that now is adjusting settings in the house.

I';m not sure how much of it is marketing, this video is impressive.