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Old 3rd January 2018, 09:14 AM   #1
classAchap is offline classAchap  United Kingdom
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Thought Iíd post this pic of a 12V dc supply in the build. Itís to power a car radio that serves as my input source.IMG_0843.JPG
Itís made from recycled laptop Lion cells.
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Old 3rd January 2018, 09:27 AM   #2
AndrewT is offline AndrewT  Scotland
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How are you "managing" the recharging?
Lithium chemistry is very intolerant of poor charging management !!!!!!
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Old 3rd January 2018, 09:37 AM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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classAchap is very brave by the look of the heat required to solder the battery tab welds!
Li cells must be charged the correct way, unlike lead acid or NiCad. They also must not be completely discharged or will be permanently damaged.
Overcharge them and you will have a fire, discharge too quickly and an explosion.
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Old 3rd January 2018, 10:01 AM   #4
DF96 is offline DF96  England
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The nice thing about lithium is that it regards water as a fuel! This makes putting out fires much more interesting.
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Old 3rd January 2018, 10:53 AM   #5
classAchap is offline classAchap  United Kingdom
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Quote:
Originally Posted by JonSnell Electronic View Post
classAchap is very brave by the look of the heat required to solder the battery tab welds!
Li cells must be charged the correct way, unlike lead acid or NiCad. They also must not be completely discharged or will be permanently damaged.
Overcharge them and you will have a fire, discharge too quickly and an explosion.

True, true, true. I have a cast metal box for the battery and another separate box for the charger which consists of 3 (gutted) commercial Li-Ion chargers. The chargers are permanently connected, via Schottky diodes, and are on a timer for daytime (solar) charging and are in their own cast box.
Iíd be interested to hear of other efforts like this.
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Old 3rd January 2018, 11:04 AM   #6
Mooly is offline Mooly  United Kingdom
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I thought Li-Ion should not be trickle charged, and that to do so quickly destroyed them.
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Old 3rd January 2018, 01:39 PM   #7
classAchap is offline classAchap  United Kingdom
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Originally Posted by Mooly View Post
I thought Li-Ion should not be trickle charged, and that to do so quickly destroyed them.

Yes, I believe thatís true. I donít think this constitutes trickle charging though. The charger should not exceed 4V1 and the diode drops this to 3V6 or so. At this voltage a charged cell will just stop drawing current - I think I checked this early on. Accidental over-discharge is a greater concern but we will see - itís obviously experimental.
BTW how do you post LtSpice? Iím thinking of posting the .asc using paper clip, will that display the circuit and be downloadable to LtSpice?
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Old 3rd January 2018, 01:41 PM   #8
AndrewT is offline AndrewT  Scotland
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use the Attach described in
How to attach images to your posts.

.asc is on the list of permitted attachments.
Each Member can simply click on your attachment link and it should request an "open LTspice"
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Last edited by AndrewT; 3rd January 2018 at 01:44 PM.
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Old 3rd January 2018, 01:41 PM   #9
classAchap is offline classAchap  United Kingdom
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I must learn to edit my quotes.
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Old 3rd January 2018, 05:38 PM   #10
classAchap is offline classAchap  United Kingdom
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Quote:
Originally Posted by AndrewT View Post
.asc is on the list of permitted attachments.
Each Member can simply click on your attachment link and it should request an "open LTspice"

Ok Andrew, I see whatís happened, Iím using iPad/TapaTalk which has a different interface. I know LtSpice schematics show using the DiyAudio interface but I canít see how to show it in TapaTalk.
So, letís see if loading the .asc works:

No. That doesnít work. ĎPaper clipí goes to my photos same as Ďsceneí

Iíll see if I can get TapaTalk working on the PC maybe that will have a better GUI.
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