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Sep 18, 2003, 09:00 PM
Registered User
Daren's Avatar

Re: Re: relativley safe lipos


Quote:
Originally posted by Ulf Herder
If they make it fool poven and limit the current to ( for example) 3C at discharge nobody will use it for aircrafts or customers will disable the safety funktions!
Ulf,

You can still use the batteries at 3C (or any C), you just have to increase the capacity to match your amp draw.
(Amp draw / 3C = Minimum Capacity). But you knew that already, eh?

Daren
Last edited by Daren; Sep 18, 2003 at 09:34 PM.
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Sep 19, 2003, 07:32 AM
Florida Flyer
RD Blakeslee,
I assume then, that you leave those lipos "out in the country" and don't transport them in your flammable car or bring them home to your flammable house for "known safety practice's" recharging?
Sep 19, 2003, 01:08 PM
Lithium Member
Herb's Avatar

Re: Re: Re: relativley safe lipos


Quote:
Originally posted by Daren
Ulf, ... you just have to increase the capacity to match your amp draw. ... Daren
... which will increase the weight - as usually the capacity scales linearly with the weight - I think that is what Ulf is taking into consideration as well..
Sep 19, 2003, 01:40 PM
Registered User
Right, increase the weight enough and you might as well be using NiMH.
Sep 19, 2003, 08:34 PM
Registered User
im scared now, maybe i should just go back to
nitro planes, then again thats flamable too..
Sep 19, 2003, 09:16 PM
Registered User
Daren's Avatar

Re: Re: Re: Re: relativley safe lipos


Quote:
Originally posted by Herb
... which will increase the weight - as usually the capacity scales linearly with the weight - I think that is what Ulf is taking into consideration as well..
Don't we all.

Dave:

You may be right, but it would be hard now to give up the ease of charging. Gone are cycling, peaking, etc. Now I charge when I get home from flying and I'm ready to go for next week!

Daren
Sep 19, 2003, 09:24 PM
Registered User
Daren, it's a trade-off. The Li-poly packs are a hassle in one way and the NiMH packs are a hassle in a different way. Different people are coming to different conclusions, and I assume that everyone is correct because they are doing the right thing for themselves. I think the only time people get in trouble is when they try to do what they think they should do based on what other people are doing rather than doing what they think is best for themselves.
Sep 19, 2003, 09:45 PM
Registered User
Daren's Avatar
You're right about that. It always is.

Daren
Sep 21, 2003, 11:52 PM
Lithium Member
Herb's Avatar
Quote:
Originally posted by lagcisco
im scared now, maybe i should just go back to
nitro planes, then again thats flamable too..
Many new technologies bring new risks but also new opportinities ...

The new risks involved should be clearly and squarely addressed by the manufacturers and vendors involved.
Sep 22, 2003, 05:17 AM
Registered User
othmanskn's Avatar
[QUOTE]Originally posted by opualuan
[B]safety circuits won't help. if the cell smashes in a wreck, so will the protection circuit.

casing the battery? bad. you now have a great source of not only weight, but shrapnel in the event of a vent. now, sausaging a li-poly is bad, but I'd rather a mylar coating popping than aluminum shards being blown apart.

consumer li-ion/li-poly implementations are meant for consumer use. I can almost guarantee a ballasted cellphone dropped from 250 feet up could cause a similar issue with the li-polymer cell is contains.



For aircraft RC, all protections will be removed to save weight,
but precautions should be initiated when charging and storing.

I am most worried about the damage due to vibrations and
crashes which I keep on getting with my batteries, although
they are NiCd and NiMH only.

I shall be more careful. Thank you all for your comments.
Looking for a good container.
Jan 14, 2008, 09:13 AM
Registered User
Quote:
Originally Posted by lagcisco
im scared now, maybe i should just go back to
nitro planes, then again thats flamable too..
I gues a nitro plane(not a jet!) won't burn that fast as an damaged lipo!
I had to throw a lipo away also today,she was very swollen end had a real nasty smell!The faster it's out of my house,the better!
sven


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