So cheapest MP3 + battery safety does not go together. - Page 1
Forum section: electronics / general

author: MatthewMorgan
author_rank: Regular Contributor
timestamp: April 30, 2016, 09:42:44 am
content: I think you all notice something is missing:

author: jitter
author_rank: Frequent Contributor
timestamp: April 30, 2016, 09:56:24 am
content: Are you sure there isn't a tiny pcb under there?

author: MatthewMorgan
author_rank: Regular Contributor
timestamp: April 30, 2016, 09:57:54 am
content: Quote from: jitter on April 30, 2016, 09:56:24 amYes i am sure as the little bit is not thick egnouth for that.

author: XOIIO
author_rank: Super Contributor
timestamp: April 30, 2016, 10:03:03 am
content: It's not an mp3 player, duh, it's a hand warmer you stick in your gloves.Silly noob.

author: MatthewMorgan
author_rank: Regular Contributor
timestamp: April 30, 2016, 10:04:54 am
content: Quote from: XOIIO on April 30, 2016, 10:03:03 amI tested it and it plays mp3 files from a microsd card.No i have no charged it yet.

author: XOIIO
author_rank: Super Contributor
timestamp: April 30, 2016, 10:06:32 am
content: Quote from: MatthewMorgan on April 30, 2016, 10:04:54 amThat's so that you can enjoy music while it warms your hands, for about 30 seconds.

author: jitter
author_rank: Frequent Contributor
timestamp: April 30, 2016, 10:29:22 am
content: Quote from: MatthewMorgan on April 30, 2016, 09:57:54 amHmm, 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...

author: SeanB
author_rank: Super Contributor
timestamp: April 30, 2016, 11:13:08 am
content: 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.

author: MatthewMorgan
author_rank: Regular Contributor
timestamp: April 30, 2016, 11:38:44 am
content: Quote from: jitter on April 30, 2016, 10:29:22 amThe issue is that i do not have any fire containment.

author: SeanB
author_rank: Super Contributor
timestamp: April 30, 2016, 11:56:22 am
content: 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.

author: jitter
author_rank: Frequent Contributor
timestamp: April 30, 2016, 11:56:26 am
content: Quote from: MatthewMorgan on April 30, 2016, 11:38:44 amNot to worry:

author: stmdude
author_rank: Frequent Contributor
timestamp: April 30, 2016, 01:13:51 pm
content: Quote from: SeanB on April 30, 2016, 11:56:22 amI 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 )

author: SeanB
author_rank: Super Contributor
timestamp: April 30, 2016, 01:38:33 pm
content: 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.

author: Martini
author_rank: Regular Contributor
timestamp: May 01, 2016, 10:01:55 am
content: Agreed. Often, the protection is the charging/balancing circuit, it doesn't have to be on the cell itself.Quote from: SeanB on April 30, 2016, 11:56:22 amIt's way more fun on something conductive

author: SeanB
author_rank: Super Contributor
timestamp: May 01, 2016, 10:36:16 am
content: 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.

author: GEuser
author_rank: Frequent Contributor
timestamp: May 01, 2016, 12:52:41 pm
content: 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 ..

author: XOIIO
author_rank: Super Contributor
timestamp: May 01, 2016, 01:02:43 pm
content: Quote from: GEuser on May 01, 2016, 12:52:41 pmyeah... I would have replaced that before using it again.