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Date: Wed, 19 Jan 2011 13:07:28 -0500
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From: Hamid Wasti <hwasti@lm50.com>
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Subject: Re: [LML] Re: Lithium Batteries
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Craig Schulze wrote:
>
> These are not the troublesome Lithium Ion type. They are a newer=20
> version Lithium Iron. They have different cell voltage than Ion=92s and=
=20
> are not so sensitive to how they are charged and discharged.
>
It is _*EXTREMELY IMPORTANT*_ to stress one point here. While these=20
LiFePO4 cells are not as sensitive to mishandling as the other=20
technologies of Lithium batteries, they are _*NOT IMMUNE*_ from doing=20
bad things if mishandled. They can still cause some nasty problems=20
including a very hot fire if they are mishandled -- it just takes more=20
mishandling than other chemistries.

You can not just take a bunch of cells and put them in series/parallel=20
to make a pack and put it in your airplane to replace the lead acid=20
battery. You need to charge balance the pack and pay attention to the=20
charging voltage and over-charge/over-discharge. Better to pay some=20
reliable company to do the integration and testing than do it yourself=20
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=20
in-flight fire.

Regards,

Hamid