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Search: Posts Made By: cwatters
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Forum: Rumours & News
6th Aug 2014, 12:19
Replies: 2,185
Views: 1,032,237
Posted By cwatters

Reports elsewhere say that charging lithium cells...

Reports elsewhere say that charging lithium cells when they are too cold causes lithium plating which can cause short circuits and failure. Cold for a consumer grade lithium is 0-5C. No idea what...
Forum: Rumours & News
3rd Feb 2014, 08:27
Replies: 2,185
Views: 1,032,237
Posted By cwatters

Not sure if this has been posted before but this...

Not sure if this has been posted before but this scientist appears to be suggesting that low energy nuclear reactions (LENR) might be occurring in lithium batteries and that this might account for...
Forum: Rumours & News
3rd Jul 2013, 07:15
Replies: 2,185
Views: 1,032,237
Posted By cwatters

I don't believe that's a correct interpretation....

I don't believe that's a correct interpretation. Quite the reverse.

If Li cells are discharged too far you cannot safely recharge them. The charging minimum voltage is the voltage at which it goes...
Forum: Rumours & News
24th Jun 2013, 08:58
Replies: 2,185
Views: 1,032,237
Posted By cwatters

Boeing 787 Dreamliner diverted due to brakes |...

Boeing 787 Dreamliner diverted due to brakes | News24 (http://www.news24.com/Travel/International/Boeing-787-Dreamliner-diverted-due-to-brakes-20130624)

Los Angeles - A Boeing 787 Dreamliner jet...
Forum: Rumours & News
13th Feb 2013, 10:02
Replies: 2,185
Views: 1,032,237
Posted By cwatters

At least with most RC model packs you can see if...

At least with most RC model packs you can see if the cells have swelled up and not try to recharge them. Would be very interesting to know if any of the 787 cells replaced in service show any...
Forum: Rumours & News
11th Feb 2013, 09:15
Replies: 2,185
Views: 1,032,237
Posted By cwatters

If the battery has a 75AH capacity (reported...

If the battery has a 75AH capacity (reported elsewhere) then the peak draw works out at about 9C (eg 700/75 = 9.3C).

I'm not sure this is the right data sheet (also reported elsewhere) because...
Forum: Rumours & News
7th Feb 2013, 16:18
Replies: 2,185
Views: 1,032,237
Posted By cwatters

The photographs and notes posted by others...

The photographs and notes posted by others suggest the configuration is probably 6P8S.

In other words there are 48 cells. Six of these are wired together in parallel to make sub-batteries...
Forum: Rumours & News
31st Jan 2013, 06:36
Replies: 2,185
Views: 1,032,237
Posted By cwatters

At 16K each it must be tempting to try and...

At 16K each it must be tempting to try and recycle the batteries that have reached the low voltage cut off?

They aren't talking about 787 batteries but..

How to Awaken Sleeping Li-ion - Battery...
Forum: Rumours & News
30th Jan 2013, 17:13
Replies: 2,185
Views: 1,032,237
Posted By cwatters

It produces oxygen but not necessarily in the...

It produces oxygen but not necessarily in the vent gases...
...
Forum: Rumours & News
30th Jan 2013, 14:24
Replies: 2,185
Views: 1,032,237
Posted By cwatters

Would be nice to know what that line actually...

Would be nice to know what that line actually means because ..

Lithium Battery Failures (http://www.mpoweruk.com/lithium_failures.htm)



But that's an issue at very low voltages. The...
Forum: Rumours & News
29th Jan 2013, 16:21
Replies: 2,185
Views: 1,032,237
Posted By cwatters

A partial recap for late commers... When...

A partial recap for late commers...

When they designed the 787 I think Lithuim Cobalt was the most proven of the Lithium cell technologies available.

Since then some/many other users have...
Forum: Rumours & News
28th Jan 2013, 17:38
Replies: 2,185
Views: 1,032,237
Posted By cwatters

syseng68k - It's very unlikely the...

syseng68k - It's very unlikely the battery/charger doesn't have monitoring of the type you suggest. Earlier they said there was no evidence the battery had been overcharged so presumably some data is...
Forum: Rumours & News
27th Jan 2013, 09:09
Replies: 2,185
Views: 1,032,237
Posted By cwatters

Sounds more like the exact opposite. With most...

Sounds more like the exact opposite. With most switching away from Cobalt were Boeing perhaps a bit too slow in doing likewise?
Forum: Rumours & News
27th Jan 2013, 09:01
Replies: 2,185
Views: 1,032,237
Posted By cwatters

Another interesting article mentions cobalt v...

Another interesting article mentions cobalt v alternatives..

Faulty Lithium-Ion Batteries Ground Boeing's Dreamliner: Should EV Drivers Be Concerned? - Translogic...
Forum: Rumours & News
26th Jan 2013, 09:42
Replies: 2,185
Views: 1,032,237
Posted By cwatters

Interesting comments here on use of different...

Interesting comments here on use of different chemistry batteries in electric bikes. Comments pre date recent events.

lithium cobalt battery v lifepo4...
Forum: Rumours & News
25th Jan 2013, 14:46
Replies: 2,185
Views: 1,032,237
Posted By cwatters

http://gsyuasa-lp.com/SpecSheets/LVP65-MSDS.pdf ...

http://gsyuasa-lp.com/SpecSheets/LVP65-MSDS.pdf

"Do not expose to high temperatures (50C, 122F)"

Sorry if that's a repost.
Forum: Rumours & News
25th Jan 2013, 13:45
Replies: 2,185
Views: 1,032,237
Posted By cwatters

If that NY Times article is correct.... Here...

If that NY Times article is correct....

Here is a comparative study of different types of Lithium-Ion Batteries dated 2010 that mentions lithium cobalt oxide batteries...
...
Forum: Rumours & News
21st Jan 2013, 07:20
Replies: 2,185
Views: 1,032,237
Posted By cwatters

Don't think this was battery related.. ...

Don't think this was battery related..

Boeing: 787 fire caused by failure in aft electronics bay power panel | ATWOnline...
Forum: Rumours & News
21st Jan 2013, 06:57
Replies: 2,185
Views: 1,032,237
Posted By cwatters

The charger and battery protection systems need...

The charger and battery protection systems need to be matched with the battery cell technology, so unless that already supports a different cell chemistry (eg NiMh or NiCad) then no you can't just...
Forum: Rumours & News
20th Jan 2013, 20:20
Replies: 2,185
Views: 1,032,237
Posted By cwatters

NTSB: Excess battery voltage ruled out in 787...

NTSB: Excess battery voltage ruled out in 787 fire | HeraldNet.com - Work (http://www.heraldnet.com/article/20130120/BIZ/130129997/1005/biz)
Forum: Rumours & News
19th Jan 2013, 17:05
Replies: 2,185
Views: 1,032,237
Posted By cwatters

This investigator may have inside information but...

This investigator may have inside information but I very much doubt anyone can tell the cause from just looking at photos of the burnt remains!

Overdischarge can also cause problems for some Li...
Showing results 1 to 21 of 21


 
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