Mailing List lml@lancaironline.net Message #57250
From: Hamid Wasti <hwasti@lm50.com>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] Re: Lithium Batteries
Date: Wed, 19 Jan 2011 13:07:28 -0500
To: <lml@lancaironline.net>
Craig Schulze wrote:

These are not the troublesome Lithium Ion type. They are a newer version Lithium Iron. They have different cell voltage than Ion’s and are not so sensitive to how they are charged and discharged.

It is _*EXTREMELY IMPORTANT*_ to stress one point here. While these LiFePO4 cells are not as sensitive to mishandling as the other technologies of Lithium batteries, they are _*NOT IMMUNE*_ from doing bad things if mishandled. They can still cause some nasty problems including a very hot fire if they are mishandled -- it just takes more mishandling than other chemistries.

You can not just take a bunch of cells and put them in series/parallel to make a pack and put it in your airplane to replace the lead acid battery. You need to charge balance the pack and pay attention to the charging voltage and over-charge/over-discharge. Better to pay some reliable company to do the integration and testing than do it yourself and risk an in-flight fire. The $100 you saved by doing it yourself will feel the most expensive $100 in your wallet as you are dealing with an in-flight fire.

Regards,

Hamid

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