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21918 posts

Uber Geek
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Topic # 95530 6-Jan-2012 23:42
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I have something I want to run portable in a bag, its 12v and I was looking on aliexpress at something like this massive link - price is right for sure but....

I am a little concerned about the safety of something like that as it has a 12.6v input, so I would assume that it is just 4.2 x 3 - as in there are 3 lipo cells in there in series, without knowing what it has to ballance them, and if there is a low cell cutoff provided I expect that it would just run down once and then on the next charge over volt one of the cells leading to something going fireball in my manbag.

The requirement for 12.6 also means that charging off the car isnt going to happen unless I use an inverter and their wallwart, or else use my hobby charger on it, which I dont even know if it will charge if I dont have a balance lead connected. Also it will probably me more like 10v out once the cells start to discharge.

So what else is there that can provide a reletivly long runtime for a small 12v load? I have found many many packs that deal in 5v for USB devices, and have a decentish looking lipo charger and then a boost converter, not seen anything for 12v however.

Otherwise I may as well just use one of my 3S lipo hobby packs since at least I can charge them without concern.


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10613 posts

Uber Geek
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  Reply # 565683 7-Jan-2012 10:02
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I think you have ruled it out for safety reasons anyway but the 12.6 requirement might not be a problem for a fully charged car battery, or while driving. Check the output from your socket.

476 posts

Ultimate Geek
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  Reply # 565686 7-Jan-2012 10:18
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Isent Li-ion safer then Li-po. I know the safety risks with lipo as I use them in my rc.

12.6v should charge from a car when running as the output will be closer to 14v


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Uber Geek
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  Reply # 565759 7-Jan-2012 13:38
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There's up to 15v on the lighter socket at times when running, so that will either trigger the over volt protection if it really exists (I have doubts myself) or else overvolt one or more of the cells.

AFAIK the only benefit of Li-ion over LiPo is the physical aspect of the hard metal cell. Both are totally safe so long as you never under or over volt the cells or exceed their discharge rate to overheat them. Most hobby fires you see/hear about are damaged packs or that are being charged at well over 0.5C with no thermal monitoring.

The lack of any balance connector on the "12v" packs is concerning too as chances are the cells will just go out of balance. Unless the protection circuits they claim to have also take care of balancing them while charging.


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