Werker SLA batteries? (... better than PowerSonic?)

wrote:
We need to be careful with all the old-wifes tales that are repeated here, the devil is in the details.

Quite right. But we also need to be careful with panglossian optimism.

There are many videos on youtube showing what happens when a battery is grossly mistreated.
The results are somewhat spectacular. But so what, we wouldn't fly with batteries that had
been grossly mistreated, would we?

More interestingly, a very quick search indicated[1] Dell had to recall laptop batteries
3 times in 5 years; the last involved 4,000,000 batteries. If we assume that Dell isn't
staffed by cretins, clearly there are some subtle effects that can cause significant
problems.


Just for experimental purposes, I once put a nail through one of my 2200 AH 3p Lipos and you are right, the fire starts pretty much immediately and is next to impossible to quench. That does not mean they will burst into flames any second.

Just for fun:
- an M67 grenade has a charge of 180g, which probably equates
to around 180000J of energy
- 12V battery discharged at 4A for 1hour releases 172000J of energy


[1] http://www.youtube.com/watch?v=FuNSzs679Sw
bog-standard TV news report, so usual caveats apply

On Tuesday, April 30, 2013 2:23:31 PM UTC-5, Tom Gardner wrote:



Quite right. But we also need to be careful with panglossian optimism.



There are many videos on youtube showing what happens when a battery is grossly mistreated.



More interestingly, a very quick search indicated[1] Dell had to recall laptop batteries

3 times in 5 years; the last involved 4,000,000 batteries. If we assume that Dell isn't

staffed by cretins, clearly there are some subtle effects that can cause significant

problems.








Tom, I'm getting a bit tired of your tirades on not trying anything that doesn't go back to your college days and is "well proven". Your answer to all questions seems to be "it depends" and that is also an adult diaper brand here in the US. If you want to base your decisions on YouTube videos, I have news for you: many of them are staged or directed by morons. Sorry to get personal but please stop giving us your trivial opinions. Btw. you're mixing up your chemistry in your last post: Laptop batteries are Lipos, we are talking Life batteries here.

my2c, laptop batteries are generally all labeled Lithium Ion which encompasses all types of batteries with a Lithium electrolyte regardless of how the electrolyte is contained.

wrote:

Tom, I'm getting a bit tired of your tirades on not trying anything
that doesn't go back to your college days and is "well proven".
Your answer to all questions seems to be "it depends" and that is
also an adult diaper brand here in the US. If you want to base your
decisions on YouTube videos, I have news for you: many of them
are staged or directed by morons. Sorry to get personal but
please stop giving us your trivial opinions. Btw. you're mixing
up your chemistry in your last post: Laptop batteries are Lipos,
we are talking Life batteries here.

Wow, I'm sorry I seem to have touched a nerve.

Your posting contains:
- some ad-hominem attacks
- one informational statement
- a focus on presentation media and style, rather than
the information in the presentations
- several inaccurate and contentious statements that are
only possible because you have too heavily snipped
sections of my posting
- and a "that's the pot calling the kettle black" statement

Can I suggest that you put me in your killfile.