Some facts about vaping mods with internal lithium cell chargers.
1. A USB wall adapter or car adapter does not charge the cell it just provides about 5V direct current to the charge controller. It is the charge controller that charges the cell or cells.
2. In most cases it is not necessary to match the USB adapter to the charge controller contained in the device. Most charge controllers used in vaping devices today will automatically reduce their charging current to prevent overloading the USB adapter.
Here are a couple examples of internal lithium cell charge controllers used in real devices:
A standard Kangertech eGo-type EVOD USB charger has a USB cable attached to a dongle that contains a XT2058YSR 8-pin device attached to a threaded charging connector. That part number lists as a "Linear Charge Management chip ic" There does not appear to be an english data sheet for that device but that part number cross-references to TP4056. That is a " 1A Standalone Linear Li-lon Battery Charger with Thermal Regulation in SOP-8 " The TP4056, like most other lithium cell charge controllers, begins charging with a limited current until it reaches the terminal voltage where it switches to constant voltage operation. It continues charging at that voltage until the charging current drops to a small set fraction of the initial current and the charging stops. Stand-alone chargers work in the same way.
See pdf data sheet for the TP4056 at http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/TP4056.pdf
A Joyetech eVic VTC mini uses a 10-pin K9FH charge controller. That data sheet does not appear to be available in english but the part cross-references to a TI bq24080 , "1-A, SINGLE-CHIP, LI-ION AND LI-POL CHARGER IC". This controller also charges using the same method as stand-alone chargers.
See pdf data sheet for the BQ24080 /81 at http://www.ti.com/lit/ds/symlink/bq24081.pdf
Most internal chargers use the same charging methods as stand-alone chargers but they are slightly safer to use because there is less risk of shorting the cell contacts during removal or replacement of the cell. Internal chargers also extend the life of the cells by a small amount because they usually charge at a lower current than stand-alone chargers. Stand alone chargers with a fast-charge capability will reduce the cycle-life of cells significantly when the cells are often charged rapidly.
1. A USB wall adapter or car adapter does not charge the cell it just provides about 5V direct current to the charge controller. It is the charge controller that charges the cell or cells.
2. In most cases it is not necessary to match the USB adapter to the charge controller contained in the device. Most charge controllers used in vaping devices today will automatically reduce their charging current to prevent overloading the USB adapter.
Here are a couple examples of internal lithium cell charge controllers used in real devices:
A standard Kangertech eGo-type EVOD USB charger has a USB cable attached to a dongle that contains a XT2058YSR 8-pin device attached to a threaded charging connector. That part number lists as a "Linear Charge Management chip ic" There does not appear to be an english data sheet for that device but that part number cross-references to TP4056. That is a " 1A Standalone Linear Li-lon Battery Charger with Thermal Regulation in SOP-8 " The TP4056, like most other lithium cell charge controllers, begins charging with a limited current until it reaches the terminal voltage where it switches to constant voltage operation. It continues charging at that voltage until the charging current drops to a small set fraction of the initial current and the charging stops. Stand-alone chargers work in the same way.
See pdf data sheet for the TP4056 at http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/TP4056.pdf
A Joyetech eVic VTC mini uses a 10-pin K9FH charge controller. That data sheet does not appear to be available in english but the part cross-references to a TI bq24080 , "1-A, SINGLE-CHIP, LI-ION AND LI-POL CHARGER IC". This controller also charges using the same method as stand-alone chargers.
See pdf data sheet for the BQ24080 /81 at http://www.ti.com/lit/ds/symlink/bq24081.pdf
Most internal chargers use the same charging methods as stand-alone chargers but they are slightly safer to use because there is less risk of shorting the cell contacts during removal or replacement of the cell. Internal chargers also extend the life of the cells by a small amount because they usually charge at a lower current than stand-alone chargers. Stand alone chargers with a fast-charge capability will reduce the cycle-life of cells significantly when the cells are often charged rapidly.
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