Author Topic: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply  (Read 27559 times)

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Offline Zbig

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #25 on: September 02, 2016, 12:39:23 pm »
Can you charge it lower C rating? E.g. C/10?

Alexander.

Yes, of course. And conversely - some of them you can charge much quicker than C/2 or 1C.
 

Offline dexters_lab

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #26 on: September 02, 2016, 02:16:36 pm »
@3:20 you say any 3 1/2 inch multimeter will work... but my multimeter is 6 inches tall, will it be ok?

 :-DD

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Offline R005T3r

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #27 on: September 02, 2016, 02:19:58 pm »
Speaking about recharging batteries, I have these Ni Mh here:


I have to recharge them, but There's no datasheet so I'm not sure about what to do. However, it's known:
1. capacity 5300mAh
2. rated 1.2V
3. "standard charge" : 530mA 15 h
4. "rapid charge": 1500mA 5 h

I have a Sony battery charger but refuses to charge them as soon as I plug them in ( :-//  I still have to figure out why... Everything seems ok according to what's written on the charger datasheet), so I can't recharge them in any way. I do have a Power supply (Agilent U8002A)
 

Offline Zbig

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #28 on: September 02, 2016, 02:27:14 pm »
Speaking about recharging batteries, I have these Ni Mh here:


I have to recharge them, but There's no datasheet so I'm not sure about what to do. However, it's known:
1. capacity 5300mAh
2. rated 1.2V
3. "standard charge" : 530mA 15 h
4. "rapid charge": 1500mA 5 h

I have a Sony battery charger but refuses to charge them as soon as I plug them in ( :-//  I still have to figure out why... Everything seems ok according to what's written on the charger datasheet), so I can't recharge them in any way. I do have a Power supply (Agilent U8002A)

Given that they have blatantly lied about their capacity, who knows what else could be wrong with them. There's no way in hell these are 5300 mAh
 

Offline R005T3r

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #29 on: September 02, 2016, 02:40:08 pm »
Well, let's charge them... I'm setting up my fire extinguisher and a specific pot to see if they explode during the charging process..
 

Offline Zbig

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #30 on: September 02, 2016, 03:11:31 pm »
Well, let's charge them... I'm setting up my fire extinguisher and a specific pot to see if they explode during the charging process..

Be aware that almost none of what Dave has said regarding Lithium-based chemistry charging process does apply to Ni-Mh. CC/CV method shouldn't be used with Ni-Mh/Ni-Cd and the detection of full charge state is quite tricky with these. The current won't just taper off gracefully to let you know they've had enough. Instead, the "-dV" detection method is most commonly used by the quick chargers and you won't achieve that with a PSU alone. Or you could just trickle charge them very slowly. Keep in mind that the realistic capacity of these could be 2000 mAh or less. If these are real cells at all, that is.
« Last Edit: September 02, 2016, 04:51:04 pm by Zbig »
 

Offline R005T3r

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #31 on: September 02, 2016, 03:31:36 pm »
Ok, it's better if I make some research before I try to charge them...
 

Offline Rbastler

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #32 on: September 02, 2016, 04:15:59 pm »
Where's the video ?   :-//
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Offline RGB255_0_0

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #33 on: September 02, 2016, 04:25:23 pm »
It got pulled and reuploaded. And then pulled again.
Your toaster just set fire to an African child over TCP.
 

Offline Zbig

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #34 on: September 02, 2016, 04:48:06 pm »
Ok, it's better if I make some research before I try to charge them...

http://batteryuniversity.com is a good source.
 
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Online NANDBlog

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #35 on: September 02, 2016, 04:52:38 pm »
Ok, it's better if I make some research before I try to charge them...
You should probably just throw away them at the local recycle bin for batteries. There is no way they are 5300mAh, so they lie, they know they are lying, because NiMh batteries end at around 3400mAh . Maybe it is not secondary battery, they lie about that too.
 

Offline whitevamp

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #36 on: September 02, 2016, 06:00:01 pm »
Video taken down? Can't seem to view it over here and it doesn't appear on the YouTube channel list either.
says privet
 

Offline doobedoobedo

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #37 on: September 02, 2016, 06:04:10 pm »
Video thumbnail has UltraFire 18650 on it but in the video it's not explained that these are deathtraps and should never be used! People might get the wrong idea and start buying those unprotected/sand filled/reused laptop cells 6000mAh 18650's that may blow up at one point.
I have personally seen some of them overheat when charging to a point where my charger cut them off. With this bench supply setup there is no temperature monitoring. After taking the labels off those overheated batteries i saw they were just some old trash picked and very rusty unknown laptop cells that had new caps and UltraFire 4000 mAh label stuck onto them.

No need to be embarrassed by those Sony, Panasonic, Samsung or LG cells you use any more. Make any battery an UltraFireTM, just think of the capacity gains alone!
« Last Edit: September 02, 2016, 06:06:57 pm by doobedoobedo »
 

Offline bxs

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #38 on: September 02, 2016, 06:28:33 pm »
So Dave, you don't have a charger for 18650... maybe I'm seeing things:


 :-DD

For a safe charge at least the temperature also have to be monitored.

And the UtraFire 18650, remove that thing from the video or somebody will end up buying that piece of sh*t.

 

Offline ez24

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #39 on: September 02, 2016, 07:26:32 pm »
Video taken down? Can't seem to view it over here and it doesn't appear on the YouTube channel list either.
says privet
Maybe some sort of government secrets were given away?  Maybe it is possible to make H bombs with Rigol PS and 18650s, who knows (I do not understand Li ion chemistry).  After all CC-CV sounds scary.  So I assume only top secret officials can view the video now.  Glad I saw it before it went black and I hope the end of life did not start with this video  :palm:

ps - I would like someone to explain to me why 18650 batteries cannot be used for H bombs.  After all lithium is used for H bombs.
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Offline mtdoc

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #40 on: September 02, 2016, 07:49:04 pm »
Video taken down? Can't seem to view it over here and it doesn't appear on the YouTube channel list either.
says privet
Maybe some sort of government secrets were given away?  Maybe it is possible to make H bombs with Rigol PS and 18650s, who knows (I do not understand Li ion chemistry).  After all CC-CV sounds scary.  So I assume only top secret officials can view the video now.  Glad I saw it before it went black and I hope the end of life did not start with this video  :palm:

I'm sure Dave will fix this once he wakes up and see's it. It's 5:45 AM in Sydney now. 

I'm looking forward to this video.
 

Online MasterTech

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #41 on: September 02, 2016, 07:50:02 pm »
ps - I would like someone to explain to me why 18650 batteries cannot

Most electrically powered ordnance uses a technology called "thermal batteries", in which the electrolyte is solid at ambient temperatures but must be in liquid state for electron exchange to happen and thus current to be produced. This is accomplished by interleaving pyrotechnic discs inside the battery that are fired prior to use, when the electrolyte melts it will start generating energy. This will last for seconds to minutes depending on the battery.
The reason to use this tech is simple, self discharge is non-existent.


 

Offline Mr.Martin

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Offline Involute

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #43 on: September 02, 2016, 08:32:37 pm »
Why is this video private?  I'd like to watch it.
 

Offline ez24

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #44 on: September 02, 2016, 08:47:25 pm »
Here is a link to the video.  ;D

https://www.eevblog.com/podpress_trac/web/8062/0/EEVblog919-Li-IonBatteryPSUcharging-640x360.m4v
Holy crap it is getting worse (see pic) OR is it part of the conspiracy?  Or is it an alien video (ps my Firefox crashed also thus confirming the alien conspiracy theory)
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Offline Mr.Martin

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #45 on: September 02, 2016, 09:10:33 pm »
C
Here is a link to the video.  ;D

https://www.eevblog.com/podpress_trac/web/8062/0/EEVblog919-Li-IonBatteryPSUcharging-640x360.m4v
Holy crap it is getting worse (see pic) OR is it part of the conspiracy?  Or is it an alien video (ps my Firefox crashed also thus confirming the alien conspiracy theory)

I used Chrome to download. And than i can open it with VLC-Player.
I found the Link in the Blog-Post under the YT-Video -> https://www.eevblog.com/2016/09/02/eevblog-919-how-to-charge-li-ionlipo-batteries-with-a-power-supply/
 

Offline Involute

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #46 on: September 02, 2016, 10:15:08 pm »
Thanks.  I was able to download and watch, but why was it private to begin with?
 

Offline Fungus

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #47 on: September 02, 2016, 10:33:46 pm »
I did not notice Dave's remark that you could just dial the PSU voltage up a bit to compensate for the cable voltage drop.

The cable voltage drop will be negligible at the end when the charge current drops below 100mA or so.
 

Offline FrankBuss

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #48 on: September 02, 2016, 10:46:21 pm »
Ok, if you are desperate you can use your power supply to charge a LiPo battery, but I prefer my iMAX lipo balance charger. Costs less than 20 bucks at eBay and has all the features you need, like automatic stop charging after some time or even after some energy, and works perfectly for my 3s and 4s copter batteries as well (these bigger batteries have a big main connector, usually EC3 or XT60, and a smaller XH connector which is connected to each cell for balancing).

BTW, what do you think about parallel charging LiPo batteries? I have this extension for my charger and I've used this with up to 4 batteries in parallel. Of course, before start charging I measure all batteries, and I don't connect two batteries in parallel, if the difference is more than a few 10 mV for one cell, to avoid high balancing currents (once I connected the balancing connector backwards and then the main connector and after this I had to solder a new connector to the battery, because the sparks caused some bad black deposits on the contacts). But I've read you should do this with batteries with the same capacity (and age) only, but why this limitation? Once the voltage is the same for all cells of all batteries, it shouldn't matter.
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Offline ez24

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Re: EEVblog #919 - How To Charge Li-Ion/LiPo Batteries With A Power Supply
« Reply #49 on: September 02, 2016, 11:06:22 pm »
BTW, what do you think about parallel charging LiPo batteries? I have this extension

Interesting item - can use three to charge 18 in parallel (wired not timed - private joke)  a US link:

http://www.ebay.com/itm/YoCoo-2-6S-RC-Lipo-Battery-Charger-Parallel-Balanced-Charging-Plate-Charging-/391526515453?hash=item5b28cc82fd:g:mMgAAOSwIgNXpsa6

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