[NSRCA-discussion] LI-IO packs
John Gayer
jgghome at comcast.net
Thu Oct 31 14:52:55 AKDT 2013
Thanks, Jon.
Good reason to have Lions in the 42% Carden, then. I do believe that
Scotts have no balance connectors. I'm using Lipos in a 37% Extra but
they are well wrapped in foam.
John
On 10/31/2013 3:54 PM, Jon Lowe wrote:
> Lithium ion (LiIo) cells are more rugged than lithium polymer. I
> won't use lipo receiver batteries in a fuel airplane because of the
> aluminum foil tabs that serve as positive and negative terminals.
> Seen too many failures. I used lithium ion batteries from Central
> (NMP) when I flew YS. Never had a failure due to the cells
> themselves. Lithium ions will still burn if overcharged, but
> mechanically are much more rugged. As Jim Oddino said, lipos are good
> for fast discharging. LiIo's are great for less demanding current
> draw, such as receiver/servo packs. Even with a regulator, they are
> still lighter than NiMh packs. The LiIo cells sold for RC use are
> identical to those used in most laptop computers, although newer
> ultrathin laptops have started using LiPo's.
> For a long time, 2 cell Lilo packs came without balance plugs. Later
> ones from NMP do. I recommend balance charging 2 cell lithium ion
> packs at least occasionally, because a few I've had have gone out of
> balance.
> Jon
> -----Original Message-----
> From: Scott McHarg <scmcharg at gmail.com>
> To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Sent: Thu, Oct 31, 2013 4:33 pm
> Subject: Re: [NSRCA-discussion] LI-IO packs
>
> They came with the plane? :)
>
>
> On Thu, Oct 31, 2013 at 4:23 PM, John Gayer <jgghome at comcast.net
> <mailto:jgghome at comcast.net>> wrote:
>
> No, Lithium-Ion cells appear to be expensive, heavy lipos. both
> seem to charge to approximately 4.2.
> http://en.wikipedia.org/wiki/Lithium_ion_battery#Charge_and_discharge
> http://en.wikipedia.org/wiki/Lithium_polymer_battery
>
> There appears to be a weight and price penalty associated with the
> litium-ion battery over the lithium-polymer battery with no
> benefit. Perhaps someone can explain the popularity of lithium-ion?
> John
> On 10/31/2013 1:21 PM, joddino at socal.rr.com
> <mailto:joddino at socal.rr.com> wrote:
>
> ---- Daniel Dupont <dansy44 at gmail.com
> <mailto:dansy44 at gmail.com>> wrote:
>
> So Jim if I understand correctly Lithium-ion cells are
> basically cheap
> Lipo¹s?
>
> Hum I always believed they were a slightly different
> technologyS(.
>
> Daniel on MacBook Pro
>
>
>
>
> On 10/31/2013, 1:46 PM, "joddino at socal.rr.com
> <mailto:joddino at socal.rr.com>" <joddino at socal.rr.com
> <mailto:joddino at socal.rr.com>>
> wrote:
>
> ---- Scott McHarg <scmcharg at gmail.com
> <mailto:scmcharg at gmail.com>> wrote:
>
> Morning y'all,
>
> I've spoken to a few people about charging Lithium
> Ion packs but we did
> not
> arrive at a definitive answer. I need to
> understand what the best
> solution
> (besides buying another charger) is for my situation.
>
> I consider myself fairly knowledgeable about the
> Cellpro 10XP. Usually,
> it's me giving the help but I'm not sure what to
> do here. Here's the
> scenario:
>
> Cellpro 10XP Multi-Chemistry Charger. The User
> Manual and everything
> about the charger says that it can charge the ION
> packs. So, I go to
> program a preset for this but in the software,
> there is nothing that
> says
> anything about ION packs. There is LiPo, Pb,
> A123, Ni-Cd, and Nickel
> Metal. I have some ION 7.4V 5200mah packs that I
> need to charge and a
> 2600mah pack for the ignition on a 42% Edge 540.
> The packs are made of
> 4
> cells but are wired so that they are only 2 (2 in
> series, 2 in parallel)
> cells. As close as I can tell, I should select
> the LiPo 2sU (2 cell
> unbalanced) but I don't want to make a mistake.
> Someone told me that
> would
> be OK and another said that if you program the
> charger by the charger
> instead of the software, there is an ION setting
> but I haven't confirmed
> that yet as it was late last night when I was
> checking.
>
> Anyone have any idea what to do to charge these packs?
>
> Thanks,
>
> --
> *Scott A. McHarg*
> Sr. Systems Engineer - Infrastructure
>
> If they are lithium-ion cells they should be charged
> to 4.2 volts per
> cell or 8.4 volts for a 2s pack. Lithium polymer
> cells are lithium ion
> and are charged the same. My Cellpro charger charges
> to 4.204 volts per
> cell when set for LiPo packs and that is what should
> be used for Lithium
> ion. The Lithium ion cells generally have higher
> internal resistance and
> therefore can not be discharged or charged at high
> rates. I use one C
> max.
>
> Jim O
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>
> The first Li-Ion cells used in the RC industry were packaged
> in metal cylindrical cans similar to NiCds. Then the packs
> packaged in flexible plastic sacks arrived for use in powering
> motors. These came to be referred to as LiPo packs but
> basically used the same chemistry but also had the advantage
> of having low internal resistance. Since those early days
> many other chemistries with different fully charged voltages
> have arrived and many charger suppliers have tried to cover
> them as well. The voltages printed on the packs are typically
> a nominal voltage and might be 7.2, 7;4 or 7.6 volts even
> though the full charge voltage is 8.4. I suspect the cells
> referred to here have the metal cans and that is why they are
> described as Li-Ion. Hope this helps.
>
> Jim O
>
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>
>
>
> --
> *Scott A. McHarg*
> Sr. Systems Engineer - Infrastructure
> _______________________________________________
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