On Wednesday, April 4, 2018 at 2:45:06 PM UTC-7, Chris Rowland wrote:
At 20:25 04 April 2018, jfitch wrote:
On Wednesday, April 4, 2018 at 12:00:07 PM UTC-7, Chris Rowland wrote:

The reservation about Lithium based batteries I have is their tendency
to
catch fire. I realise that this depends on the chemistry and
manufacture
but there have been enough instances of this that I'd be inclined to be
cautious unless the reduced mass and increased energy density is
essential.

Please relate to us the stories (with backup links) about - specifically
-
=
LiFePo4 batteries catching fire in gliders - or other similar
applications.


The more literate members of this forum will notice that I said "Lithium
based" and "this depends on the chemistry and manufacture".

A couple of links a
http://ul-segelflug.de/images/storie...017_G-GSGS.pdf

and

https://assets.publishing.service.go...-AOP_09-15.pdf

and

https://www.caa.co.uk/Commercial-ind...ium-batteries/

An experiment to try is to short out a fully charged battery and see what
happens. Wait until everything is cool and think if you want to be around
it.

Chris

These incidents have nothing to do with LiFePo4 batteries. Plenty of fires from SLA batteries as well, which also have different chemistry.

Regarding a BMS - this is similar to saying "lithium battery". There is a wide variety of things called a BMS, some have overcharge and/or undercharge protection, some have cell balancing, some have high current disconnects, some have more than one, or all of these facilities.

Technology is getting more complicated these days folks. Let's not throw the baby out with the bathwater by terming it all "washing".