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Re: [Fwd: Re: [avr-chat] Li-ion cell phone batteries]
From: |
Blake Leverett |
Subject: |
Re: [Fwd: Re: [avr-chat] Li-ion cell phone batteries] |
Date: |
Sun, 30 Mar 2008 21:01:35 -0600 |
User-agent: |
KMail/1.9.7 |
On Sunday 30 March 2008, Joerg Wunsch wrote:
> I don't really understand why the danger of LiIon and LiPo cells is
> often exaggerated. Yes, they can burn when being handled improperly.
> But about any kind of battery with enough stored energy in it is
> dangerous, in one way or another. Your 44 Ah car battery is probably
> much more dangerous than an 800 mA LiIon cell. It contains lead acid,
> and its stored energy can easily arrange for an explosion if you
> shortcut the battery e.g. by dropping a tool onto it that doesn't
> evaporize within a few hundred milliseconds. Yet, nobody talks about
> banning lead acid batteries...
I don't think I was exaggerating the dangers. And I do agree that LiIon
batteries are safe in cellphones and laptops. LiIon batteries are more
dangerous than other types for two reasons - LiIon's are less forgiving of
mishandling, and they are MUCH more flammable than other types. Of course
any battery can start a fire, but other batteries do not themselves burn so
much.
So, the main message is to be careful - don't abuse LiIon batteries, and keep
them in a fireproof container if there's any question about the battery.
Remember the OP was talking about using a used battery from an unknown
source. Not every engineer knows about the special properties of these
batteries, and learning by experience is costly.
Blake