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On 16/02/2013 11:14 AM, Gene E. Bloch wrote:
On Fri, 15 Feb 2013 10:28:02 -0500, Paul wrote:

BillW50 wrote:


When you have a dead lithium battery which the voltage drops too low
(due to sitting too long without being charged), which the machine will
refuse to charge for safety reasons. One has a few options.

One is to charge it manually and thus bypassing the safety. This is
pretty dangerous since lithium batteries can burst into flames if the
voltage is too low and you try to recharge them. If it does burst into
flames, I believe water makes this chemical fire only worse. So to be
safe, I guess to do this outside and if it does burst into flames, do it
in an area where nothing else around will burn. As I don't know if you
can stop it from burning without special equipment for chemical fires.

Another trick is to put the battery in the freezer. I don't know why
this sometimes works. I'm guessing as the battery voltage is higher when
cold. Then drop it into the machine. And it might be enough to convince
the safety circuits it is ok to charge.

I tried the latter trick first with this dead battery and it brought it
back to life. So this is something one can try if they find themselves
in a similar situation.


I like this site, for it's in-depth articles.

http://batteryuniversity.com/learn/a..._ion_batteries

http://batteryuniversity.com/learn/a...w_temperatures

"Many battery users are unaware that consumer-grade lithium-ion batteries
cannot be charged below 0°C (32°F). Although the pack appears to be
charging normally, plating of metallic lithium can occur on the anode
during a subfreezing charge. The plating is permanent and cannot be
removed with cycling. Batteries with lithium plating are known to be
more vulnerable to failure if exposed to vibration or other stressful
conditions."

HTH,
Paul

Such as Boeing 787s?



Different problem.

On Sat, 16 Feb 2013 12:47:24 +1100, Rob wrote:

On 16/02/2013 11:14 AM, Gene E. Bloch wrote:
On Fri, 15 Feb 2013 10:28:02 -0500, Paul wrote:

BillW50 wrote:


When you have a dead lithium battery which the voltage drops too low
(due to sitting too long without being charged), which the machine will
refuse to charge for safety reasons. One has a few options.

One is to charge it manually and thus bypassing the safety. This is
pretty dangerous since lithium batteries can burst into flames if the
voltage is too low and you try to recharge them. If it does burst into
flames, I believe water makes this chemical fire only worse. So to be
safe, I guess to do this outside and if it does burst into flames, do it
in an area where nothing else around will burn. As I don't know if you
can stop it from burning without special equipment for chemical fires.

Another trick is to put the battery in the freezer. I don't know why
this sometimes works. I'm guessing as the battery voltage is higher when
cold. Then drop it into the machine. And it might be enough to convince
the safety circuits it is ok to charge.

I tried the latter trick first with this dead battery and it brought it
back to life. So this is something one can try if they find themselves
in a similar situation.


I like this site, for it's in-depth articles.

http://batteryuniversity.com/learn/a..._ion_batteries

http://batteryuniversity.com/learn/a...w_temperatures

"Many battery users are unaware that consumer-grade lithium-ion batteries
cannot be charged below 0°C (32°F). Although the pack appears to be
charging normally, plating of metallic lithium can occur on the anode
during a subfreezing charge. The plating is permanent and cannot be
removed with cycling. Batteries with lithium plating are known to be
more vulnerable to failure if exposed to vibration or other stressful
conditions."

HTH,
Paul

Such as Boeing 787s?


Different problem.

Apparently.

--
Gene E. Bloch (Stumbling Bloch)