View single post by Pete Steinmetz
 Posted: Mon Mar 2nd, 2015 05:11 am
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Pete Steinmetz

 

Joined: Tue May 29th, 2012
Location: Encinitas, California USA
Posts: 63
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Dan:

This is so off the wall as to not even be reasonable. You are not comparing apples to apples. Far from it.

You are grabbing a little info from one market (Bicycle lights). Then grabbing a little from another market (Flashlights)..

So far, none of this has anything to do with what we are doing which is model trains.

All applications are different. You can't compare battery usage in bicycle lights and flashlights to model trains. It doesn't work that way.

First, the guy in Texas is using a series parallel configuration. A PCM on these cells will affect the balance. We are using a straight series configuration. You can't compare the two. They re completely different.

The pack you referenced must be shipped as Class 9 Hazardous goods or the seller is in violation of federal law. Special packaging is required and it must be marked and registered. They are not allowed to be shipped by USPS under any circumstances. They can only be shipped by ground transportation as Class 9.

He knows a lot about batteries. However he must be buying Panasonic Cells on the Grey Market as authorized Panasonic Distributors are required to sell Panasonic Lithium Ion cells with a protection circuit.
Here is the data sheet from one of the cells he is selling.

http://tinyurl.com/mlczc8p
Read the Panasonic requirement.
I believe this cell is used in E cigarettes.

Here is another Panasonic cell he i referencing.
http://tinyurl.com/k3dvzna
Read the Panasonic requirement.
This is for a bicycle light.
No comparison to what we are doing.

The Ultrafire are flashlight batteries designed to be used in single cell applications. Some have protection, some don't.
Nothing to do with model trains. Once again, you are comparing apples to oranges.

Battery Junction is a fine supplier, but they are not a Panasonic Industrial Authorized Assembler. Their rechargeable Lithium products are from secondary suppliers.

You are free to use protection or not. It's entirely up to you.

The thing I resent is you are trying to act like you know something about batteries and you clearly know just enough to be dangerous.

You show this by grabbing some technical info from the flashlight industry, the bicycle industry, and the E Cigarette industry and applying that information to model trains. Apples and oranges.

Someone who was well versed in batteries would not do that.

I hope that the model train guys that read your posts, don't use your information in their model trains.

If they have bicycle lights, E Cigarettes, and flashlights, this info is mostly correct, but it doesn't apply to model trains.

All applications are different.

I currently have a project going with a high end flashlight manufacturer. I researched a lot of cells and chose a Panasonic cell with protection.

I was asked by an E Cigarette manufacturer to design a battery for their product. I declined.

Mostly I work on design of battery powered hand held medical devices using Lithium Ion and Lithium Polymer batteries from major suppliers.

My RC credentials include matching cells and supplying packs that won National Championships in RC Cars, RC Airplanes, and RC Boats. These were with Ni-Cd packs.
I'm not involved with current LiPo cars, or flight. Way to many mad scientists.

Pete Steinmetz



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Pete Steinmetz
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