EEVblog Electronics Community Forum
General => General Technical Chat => Topic started by: MatthewMorgan on April 30, 2016, 09:42:44 am
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I think you all notice something is missing:
(http://i.imgur.com/JPJ2Qk9.jpg)
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Are you sure there isn't a tiny pcb under there?
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Are you sure there isn't a tiny pcb under there?
Yes i am sure as the little bit is not thick egnouth for that.
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It's not an mp3 player, duh, it's a hand warmer you stick in your gloves.
Silly noob.
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It's not an mp3 player, duh, it's a hand warmer you stick in your gloves.
Silly noob.
I tested it and it plays mp3 files from a microsd card.
No i have no charged it yet.
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It's not an mp3 player, duh, it's a hand warmer you stick in your gloves.
Silly noob.
I tested it and it plays mp3 files from a microsd card.
No i have no charged it yet.
That's so that you can enjoy music while it warms your hands, for about 30 seconds.
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Are you sure there isn't a tiny pcb under there?
Yes i am sure as the little bit is not thick egnouth for that.
Hmm, I wonder...
Could you push down on the silver sleeve? I think I'm seeing steps in it indicating the battery might actually be a bit smaller than it seems, leaving room for a pcb after all...
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A little bit overcharged. No protection board means the cells came from a reject bin at some manufacturer, where they had failed in production test after tabbing, and before the board was attached.
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Are you sure there isn't a tiny pcb under there?
Yes i am sure as the little bit is not thick egnouth for that.
Hmm, I wonder...
Could you push down on the silver sleeve? I think I'm seeing steps in it indicating the battery might actually be a bit smaller than it seems, leaving room for a pcb after all...
The issue is that i do not have any fire containment.
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Little ones do not really burn that much, just do it on a non flammable surface and away from curtains. A nice big metal baking tray works, or a ceramic tile. Taken a few apart, even the bulging ones. Just keep something handy like a big box of baking soda to act as a fire retarder if it dopes start burning. Or use a small cheap dry powder fire extinguisher handy.
I am lucky, I have both dry powder, halon and CO2 all in easy reach.
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The issue is that i do not have any fire containment.
Not to worry ;D:
https://www.youtube.com/watch?v=uI1eRy0uBI8&t=4m57s (https://www.youtube.com/watch?v=uI1eRy0uBI8&t=5m14s)
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I am lucky, I have both dry powder, halon and CO2 all in easy reach.
I hope you know how Halon works. That shit is crazy dangerous if you get it in your lungs.
( It basically binds with oxygen (i.e, no more oxygen), and it's heavier than air, so if it gets in your lungs, it stays there for a while )
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Does not bind with oxygen, but displaces it. Heavier than air so yes it tends to collect at the bottom of the lungs, but it does diffuse out pretty fast. Biggest issue is that it decomposes on hot metal surfaces ( catalysed decomposition) to create gaseous HF acid, and other chlorine and flourine compounds which are incredibly corrosive.
However it does have the advantage of zero cleanup. CO2 the same, just that it takes a lot more to blanket the same area.
Dry powder is great on most fires but the cleanup is a pain, and as it is a very corrosive powder it basically destroys all electronics it get on or in. Great for fires not involving oils or burning liquids. For those a water mist or foam is still the best, to cool the liquid below combustion temperature.
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Agreed. Often, the protection is the charging/balancing circuit, it doesn't have to be on the cell itself.
Little ones do not really burn that much, just do it on a non flammable surface and away from curtains. A nice big metal baking tray works, or a ceramic tile.
It's way more fun on something conductive ;D
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I chop them open on the work sink, which is stainless steel. Put the plug in and fill with a little water as well, to drop the cell in to finish off it's reactions. Not going to do that with a big cell, will do it outdoors on the concrete slab with the hose available. But for small ones it is fine.
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The other week the cover covering the battery underneath the Razor Mamba wireless mouse kept popping off and would not go back on properly , after investigation the battery had bulged , further investigation after pulling the battery apart it sure was bulged , i had to prick it with a pin and flatten it and then sealed the hole with rubber gasket maker so i could put back on the cover properly .
Its still holding a 4 to 5 hours worth of use but seeing this thread reminds me to order a new battery for it to happen all over again ..
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The other week the cover covering the battery underneath the Razor Mamba wireless mouse kept popping off and would not go back on properly , after investigation the battery had bulged , further investigation after pulling the battery apart it sure was bulged , i had to prick it with a pin and flatten it and then sealed the hole with rubber gasket maker so i could put back on the cover properly .
Its still holding a 4 to 5 hours worth of use but seeing this thread reminds me to order a new battery for it to happen all over again ..
yeah... I would have replaced that before using it again.