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Are you wary of Li-Po batteries?
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 Posted: Mon Jul 13th, 2015 07:45 am
   
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Tony Walsham
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Same chemistry is understood.
But, there must be something about them that convinced Master Instruments (Australian Sanyo battery distributors) NOT to sell Li-Po because they consider them to be too dangerous for the general public in Australia to handle.



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 Posted: Mon Jul 13th, 2015 10:57 am
   
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Herb Kephart
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While we are on all this battery talk--

Does anyone know of a source for IiFe single cells that are flat? I find that thickness is the thing that limits whether a cell will fit, more than any other factor. LiPo cells seem to come flat, as a matter of course, but the few LiFe cells that I can find, are round.

I also understand that LiFe cells do not require protection
circuits. Consensus?

Herb



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 Posted: Mon Jul 13th, 2015 12:19 pm
   
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Bob D
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Herb,

Hobby King is the only place I can find them:

LiFe Batteries

BobD.



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 Posted: Mon Jul 13th, 2015 02:49 pm
   
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Herb Kephart
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Yeah Bob, but their ''packs'' seem to be made of 2 round cells.
Was hoping that by now someone was making real flat, thin, cells but I guess there is something in the chemistry that prevents that. Plus is they they do offer 15mm thick packs. Minus is that might still be too thick (have to check tonight) and Hobby King batteries don't have the greatest reputation. Guess that they are the only game in town. Thanks.

Herb



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 Posted: Mon Jul 13th, 2015 07:24 pm
   
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Bob D
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Herb,

We have a Debbie's RC World down here in Chesapeake VA and I recall seeing some flat batteries the last time I was there.  Here's the link, but their online store kinda stinks:

DEBBIES RC WORLD

ONLINE STORE

Bob D.



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 Posted: Mon Jul 13th, 2015 08:00 pm
   
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Tramcar Trev
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I have a box of flat nicad's you can have Herb....
Yet again the chemical differences are not that great, some test results here: http://rightbattery.com/lipo-liion-life-batteries/

Yes I believe the Li Fe batteries are safer but hard to get in different sizes/shapes other than cylindrical. LiPo with protection boards are equal.
The protection PCB's should offer more than just short circuit protection. a good one will have short circuit, voltage and charge rate built in and sometimes adjustable by jumpers on the board, if you have that you have seriously good capacity with the safety of most other batteries....

To answer Tony's question as to why Li-ion and Li-po batteries get such a bad safety reputation it may just be a case of "give a dog a bad name". Certainly there have been self combusting batteries but if you scan the media for reports there were usual back before 2011 when new tougher manufacturing rules were put in place along with newer technologies that inherently created a safer battery in the hands of the public. Notice how all the newer devices have the batteries inserted such that the average moron cant get at them to stick nails through the casing? But they are a bit like sticks of dynamite, if you have a box full of the things and one goes up the lot will soon join in the conflagration.
Li-pos are so common these days, hobbyists of all genres seem to have embraced them and look at it this way you are 1000 times more likely to be taken out by a speeding drunk on the way to the shop to buy them than you are by the thing exploding of its own free will...
Common sense should prevail though, follow the usage, storage and charge guidelines..

Last edited on Mon Jul 13th, 2015 08:03 pm by Tramcar Trev



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 Posted: Tue Jul 14th, 2015 02:57 am
   
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DavidT
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Herb, I have one of their Zippy 700 packs and it uses 2 flat cells. But choice of size is limited. My pack has puffed up from over-discharge like Lipos do so a little part of me thinks the goo on the inside might be the same...
Regards, David.

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 Posted: Tue Jul 14th, 2015 08:56 am
   
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Budd
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Getting LiPo's here in Australia is a bit difficult, I haven't been able to get them out of USA at all, postage is a definite no-no. HobbyKing seem to be able to post them from China with no problems, I have a lot of their larger 3C LiPo packs in the garden railway trains but haven't found anything suitably small enough to use with the Deltang in H0, Bernard Snydook of The Model Works here in Australia has come to my rescue with batteries and good service, he responded to an early enquiry with "I have a good range of 3.7v C1 LiPo's in stock ranging from 12x18x4mm 180mAh to 42x22x4mm 680mAh, all batteries have a protection circuit built in and are designed to be used with a 4.3v charger".
I have the batteries and they do have protection so I am a happy LiPo user.

Wayne from Oz.



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 Posted: Tue Jul 14th, 2015 10:36 am
   
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Tony Walsham
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So smaller single cell Li-Po batteries are available with protection pcb's
How about bigger Li-Po packs with say 4 cells for Large Scale locos?
Are they available with protection circuits?



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 Posted: Tue Jul 14th, 2015 12:23 pm
   
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Herb Kephart
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Bob-

You are right about Debbies site. Enter any description with ''cells'' or ''batteries'' into their search, and you get some stuff about a set of racing rules.

Trev-

thanks for the offer, but small, flat. LiPos I have a drawer full of--most of which have gone under the minimum voltage from self-discharge, and I should trash them. I was hoping to find flat LiFe's because of their very low self discharge--not for any other reason.

Herb

PS Stuck an exacto knife into a 3 cell, trying to make a 2 cell battery out of it some time back. It hissed, sizzled, spit some brown goo 2-3 inches, and then gave up. Quite anticlimactic after all the exploding BS. Wiped the goo up off the workbench an I carried on. Must try it again sometime, when I have a cell that I no longer have a use for.



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