1. cool vid!

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2. The short answer is yes. Cells infact do charge one another.

   A good example is the stick grenade method.

   If you take a chain of batteries that are charged such as 3 AA batteries, stand them up and wrap them with the positive side up and balance a d battery with electric tape with the positive d pointing down the charged AA's will slowly drain into the D battery.

   It's sort of like connecting a dead 9vt with a charged 9vt. One will charge into the other until they even out and then both will die.

   I had a fun childhood lmao.

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3. That’s actually connected in series not parallel. You just flipped the polarity

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4. the real reason behind this case is very simple ,, psysics law , any electric , or electronic device TAKE AMP IT NEED , its not the power source that push current , but what is connected to the source that draw current , so the empty cell when conencted to a fully charged cell will take his specs curent , to charge himself

   its the reason why you can blow a power supply if you draw more current than his capable , but you cant fry a laptop with 900 amps over if you respect the same voltage

   thanks for your videos , your vw bus is amazing , i will never see so much 18650 in my whole real life than i can see only in one of your videos , lol ,

   you share very usefull information thanks !

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5. How do you revive a dead 18650 battery that doesn't want to charge?

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6. Hey Jehu, hello I did the same thing to power up my dead laptop batteries one cell is bad 0.0V rest I got a lithium Ion charger which can hold two cells I put in the cell with some charge on it in the charger first and then switched it off, added another almost dead cell n left it like that in 20 mins both the cells were balanced with 2.32V I then plugged in the charger and charged them full they showed 4.3 volts each and except one cell I could charge five cells I have now five fully charged 18650 cells.

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7. I'm old school and the wisdom of those days forbid batteries (dry cells, wet cells, etc.) from being connected in parallel. The premise was that the parallel bank only performed to the limitations of the lowest performing cell (discharge rate and voltage level). So it was never a simple matter of increasing current capacity by number of cells. The net gain was always disappointing. I have always assumed that there be some sort of isolation/"ideal diode" circuit for those battery banks with parallel connections. Has this changed?

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8. This shows that when 1 battery is going bad the amps are going down. But the voltage when in parallel stays the same. Connected in series and fully charging a 4s for instance would be hard to spot a bad cell. You get a total count for amps being delivered. So you would have to charge your 4s per 1s at a time to be sure. Well thats solves it hahahaha:-D

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9. So this might work for me with my drone battery

   I have the yuneec breeze.. I let one of my batteries discharge too much not using it for 2 weeks the battery charger shows blinking blue light which means it won't take a charge.. it's just a protection

   I want to jumpstart the old battery putting some current back in it without the charger

   So I think I'm going to use my good battery from the yuneec breeze that's fully charged to connect it to the positive and negative to see if it will get enough voltage so the charger will charge it

   Do you think this is a good idea?

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10. Sorry, I am late by 2 yrs. Good information, thanks. Very interested in these battery tutorials. Am 69 y.o. With lots of open calendar for learning and doing.

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11. This is very dangerous! don't do this!

    The multimeter has about 10 to 20 times the resistance of the battery itself and this is the limiting factor
    Without the multimeter the current/amps could go up to 20 or 30 amps at once and your battery might not be able to handle that kind of charging current

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12. that was a real vid….. like

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13. limiting factor is the voltage delta. The closer to equilibrium they get, the lower the current that flows.

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14. Based on what you taught me, I would have assumed that the batteries will try to balance each other so the empty cell will draw energy until they are at equilibrium (like how tanks of water will balance themselves when connected until they are equal)

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15. hi man I really love ur work and I'm making a power wall and I just need to know the safety tips please.

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16. For real, these videos are AWESOME!!! Thank you!

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17. Maybe this is why Tesla uses liquid cooling ?

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