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19594 Posts in 1255 Topics by 4910 Members - Latest Member: siksika January 23, 2017, 01:50:48 PM
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Breaktru Forum  |  eCigarette Forum  |  Battery  |  Topic: Battery chargers circuits and thoughts
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Author Topic: Battery chargers circuits and thoughts  (Read 3035 times)

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Offline utak3r

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Battery chargers circuits and thoughts
« on: February 15, 2013, 07:36:03 AM »
Very informative document from Analog Devices about chargers: from NiHM to Li-Ion.


Offline steamEngine

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Re: Battery chargers circuits and thoughts
« Reply #1 on: February 19, 2014, 08:26:00 AM »
 :thumbsup: thanks for sharing utak3r

Offline tj138waterboy

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Re: Battery chargers circuits and thoughts
« Reply #2 on: March 28, 2015, 10:29:16 PM »
removed for saftey reasons
« Last Edit: March 31, 2015, 09:21:49 AM by tj138waterboy »

Offline CraigHB

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Re: Battery chargers circuits and thoughts
« Reply #3 on: March 29, 2015, 04:45:34 PM »
You're not specifying much there so I can't tell, but if you're trying to charge an e-cig like that directly off a wall adapter without a charger controller in between, that would be hazardous.  Applying more than 4.2V to an e-cig like that has a high likelihood of causing a battery fire, aside from the severe damage to the battery it will cause otherwise.

Offline tj138waterboy

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Re: Battery chargers circuits and thoughts
« Reply #4 on: March 29, 2015, 05:24:05 PM »
post removed for saftey reasons
« Last Edit: March 31, 2015, 09:21:21 AM by tj138waterboy »

Offline CraigHB

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Re: Battery chargers circuits and thoughts
« Reply #5 on: March 30, 2015, 04:29:34 PM »
I don't really understand what you're doing here since your description is sketchy, but generally speaking you simply can not safely charge a Li-Ion battery without a charger controller.  The thing is voltage has to be regulated to 4.2V exactly and current has to be limited to the maximal charging rate, usually no more than 1C or one times the charge of the cell.  To try and attempt this without using some kind of device that regulates voltage and current exactly is asking for trouble.  If you are charging without a controller it's your prerogative to attempt this despite any advice on my part, but for anyone else don't do it.

Furthermore, the eGo type batteries don't use a direct connection to the Li-Ion cell.  They use a scheme to handle the double duty performed by the atomizer connector.  As such, they require a special type of Li-Ion charger that is compatible with the e-cig's electronics.  So a normal Li-Ion charger will not work properly with one of these e-cigs.  Specifically, the e-cig's electronics poll the connector for charging voltage which confuses a standard Li-Ion charger.  The e-cig itself does not regulate charging voltage or current, it only performs the function of switching the connection between charging and vaping.

The more advanced eGo type battery units (like the variable ones) have additional safeties to protect the cell from various faults including over-voltage due to a charger fault.  In that case it will disconnect the cell once charger voltage exceeds an amount over 4.2V.  This is purely a safety feature to protect the cell in the event of a charger failure and is not something to be relied upon for normal charging.  Also you you can't assume all e-cigs provide these safeties.  The standard eGos have none of them.  If you put 5V on a standard eGo 5V will be applied to the cell, then boom.

Offline tj138waterboy

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Re: Battery chargers circuits and thoughts
« Reply #6 on: March 31, 2015, 09:20:17 AM »
Ok I see what you are saying. I figured since the protection board was keeping it regulated down because my multimeter would bounce between 3.8 - 4.19 until the fire button shut off indicating it was fully charged but I probably won't be doing any charging again or at least with this twist pen. I finally got my box mod finished so no need for this mod anymore.

Offline Zanderist

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Re: Battery chargers circuits and thoughts
« Reply #7 on: January 02, 2017, 03:45:18 PM »
I see an old thread here sorry to bump it, but please do not attempt to make a li-ion battery charger from strach, I killed some scrap ego batteries that way.

Breaktru Forum  |  eCigarette Forum  |  Battery  |  Topic: Battery chargers circuits and thoughts
 

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