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Old Jan 18, 2008, 05:27 AM
Tearing the Skies a new one...
Sensiblenick's Avatar
Sweden: Ystad
Joined Oct 2004
4,013 Posts
Help!
Small little tiny battery question....

*pushes stone to one side and puts his head above ground*

Um... Hi?

NiMh packs.. I have a 6v 1800mah pack that sits in my Voltij's nose... and the other day (sunday) it ran flat after about 20 mins of flight... A little perturbed I switched to the foamy I'd brought and carried on flying.

Got home, Cracked open a tinnie of Guinness, and put it on charge.. "tis full" says charger.. "Nadgers" says I. I hit the de-charge button, and it only took 10 mins.. Recharged... 20 mins at about 500ma.

So very very wrong.

Any suggestions? Dead charger? Screwed up pack? Voltij giving me a hard time after 1˝ years of neglect?

We've got 11m/s forecast for tomorrow... I'm thinking of building a new pack today....

Whaddya Say people?
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Old Jan 18, 2008, 05:35 AM
F3B
satinet's Avatar
Warwickshire, England
Joined Sep 2006
5,505 Posts
out from the dungeon eh nick?

I say, chuck the pack in the bin and get a new one. Assuming that the charger works properly with other packs.

hardly worth taking any risk for the cost of a few cells surely?

seems unlikely that a charger would "sort of work" as opposed to the battery being cream crackered.

neglect, long swedish winters, guniness........ well, unravel that if you will.....
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Old Jan 18, 2008, 05:49 AM
Tearing the Skies a new one...
Sensiblenick's Avatar
Sweden: Ystad
Joined Oct 2004
4,013 Posts
I agree. But why go from "ok" to "Fudged" with no warning? .. beats me.

New pack it is then... I've just MSN'd the missus and she's nipping out to the shop for me.. 10 1500Mah R6's with solder-tags are on the way!!

Back?.. may well be the case. An order of 5 SAS Venoms has just arrived in Sweden (Thanks Alan if you read this) and Suddenly a group of Pilots has materialised.... I flew for the first time in years last sunday.. The fire is burning....
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Old Jan 18, 2008, 05:57 AM
F3B
satinet's Avatar
Warwickshire, England
Joined Sep 2006
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haven't you been flying/modelling recently then nick?

it does seem a bit weird if it's suddenly dropped off. Then batteries are weird....
btw, i assume that pic is was taken during the mid day sun??
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Old Jan 18, 2008, 06:29 AM
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Sleedo's Avatar
USA, CT, Fairfield
Joined Jul 2004
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more than likely you've got a rogue cell bringing down the pack, you could probably salvage the others but as above, better to toss it and start fresh.
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Old Jan 18, 2008, 06:52 AM
Tearing the Skies a new one...
Sensiblenick's Avatar
Sweden: Ystad
Joined Oct 2004
4,013 Posts
Quote:
Originally Posted by satinet
haven't you been flying/modelling recently then nick?

*Snippy*

btw, i assume that pic is was taken during the mid day sun??
Nope. I've been doing other things.. No flying, no passion.. But now I've got a taste and I'm back in I think.

Midday Sun? no, it was when the sun was setting at about 4pm. We're on the same lattitude as Perth/Edinburgh here... it's not all polarbears and blizzards you know.-.

Sleedo: Thanks for the advice: Once I've hauled the pack out I'll have a butchers to see if I can salvage any cells... I expected sluggish response as it was minus 5 Degrees... but I didn't expect it to die out that fast.
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Old Jan 18, 2008, 07:41 AM
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USA, CT, Fairfield
Joined Jul 2004
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-5 degrees? Better use some Lithium cells for those conditions! I used to work for an outfitters, guys would come in to buy Lithium D cells for their headlamps for arctic conditions. I used to enjoy winter sports but my Caribbean heritage prevents me from finding any joy when it's that cold.
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Old Jan 18, 2008, 08:17 AM
Tearing the Skies a new one...
Sensiblenick's Avatar
Sweden: Ystad
Joined Oct 2004
4,013 Posts
Quote:
Originally Posted by Sleedo
-5 degrees? Better use some Lithium cells for those conditions! I used to work for an outfitters, guys would come in to buy Lithium D cells for their headlamps for arctic conditions. I used to enjoy winter sports but my Caribbean heritage prevents me from finding any joy when it's that cold.
'Spose I should point out that I work in Degrees Centigrade... and that the test in my flat were at a healthy 22 degrees...

EDIT: The lady now reports that the batteries are in-house. She's a Keeper!!
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Old Jan 18, 2008, 08:47 AM
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satinet's Avatar
Warwickshire, England
Joined Sep 2006
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nick, i've heard good things about the performance of Sanyo Eneloops in low temperature conditions. Can't find the technical data, but i understand it's very good.
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Old Jan 18, 2008, 09:32 AM
characters welcome!
Mark Wood's Avatar
United States, CA, Bear Valley Springs
Joined Feb 2000
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Hiya, Nick!
Good to see you around!

mw
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Old Jan 18, 2008, 11:33 AM
Detail Freak
target's Avatar
Harbor City, CA
Joined Oct 2003
21,558 Posts
Yeah-

Try the Eneloops by Sanyo, or just put in NiCd's for cold weather.
Also, the higher capacity regular NiMH have a tendancy to self-discharge, so you need to charge right before you fly, if possible.

Not so with the Eneloops, I hear.

Oh, and BTW, how is that ASW coming along?

T
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Old Jan 18, 2008, 12:43 PM
trying to kick the habit
United States, CA
Joined Mar 2006
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If you cant find the Eneloops, there are a few other brands out that use the same construction. Just look for the NiMH's marketed with extremely low self discharge or "precharged" and you will be good to go.

http://en.wikipedia.org/wiki/Eneloop
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Old Jan 18, 2008, 01:06 PM
You must die! I alone am best.
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The Naughty Corner..Find me tweeting @slopetrashuk
Joined Sep 2003
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Hell! First TFLG and Now Nick........
It's like night of the living dead!
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Old Jan 18, 2008, 01:28 PM
find me @samotage
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Melbourne Australia
Joined Jul 2005
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hehe, don't be so cruel T. I am sure the ASW is just getting the finishing touches.

Sam,
who's been enjoying the Zagi sunset pic on his desktop the last week.
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Old Jan 18, 2008, 01:51 PM
Long to be flyin'
Antonsoarer's Avatar
Wirral, (UK)
Joined Dec 2003
3,056 Posts
Now let's see, ain't been flying for a long while and some thing's wrong with my NiMh batteries.... hmm ..not sensible at all

I once found old Sanyo nicads that hadn't seen a charge in 10 years and they still powered a rx and two servos without any top up, weird!! NiMh need more TLC for sure.

So that's TFLG and Nick, all we need is AntonL and things will get real spooky
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