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Charging batteries

Former Member

I want to first say that I am very inexperienced with electronics, I know the basics but that's about it.

 

I'm wondering if there's any way to charge a laptop/tablet battery with an external USB charger? Specifically an EasyAcc PB18000. It's got a 2.1A and a 1A USB socket, I believe they can both be used at the same time for a total of 3A. The laptop charger runs at 19.5V, 2A. Apparently it's possible to step 5V up to 20V, with a loss in current to 1/4 (I'm aware of V=IR / Ohms law). I've got a couple of questions about this though.

 

  1. When charging a tablet battery (Sony Vaio Tap 11) is it more important that the voltage matches that of the charger, or that the current does?
  2. Will it damage the battery if either of them don't match?
  3. How exactly would I go about setting this up, would I need to modify the external battery?

 

Thanks in advance, I hope this is the right place for advice!

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  • 0

    It is possible to boost the Voltage to a specific charging voltage of the battery at a compromise with current but, The charging will be severely compromised. What do you have in mind when you say charging the laptop battery, I usually use the cells of the battery and charge them using some Standard cheep Li-ion charging modules.

     

    Further, the Battery pack has an inbuilt circuit that has cells connected in series for maximum voltage needed for the Motherboard/LCD as well as it charges individual cells in parallel. I will agree with John Wiltrout charging the batteries using USB But, if you are up to the challenge, You can hack the battery pack and connect all 3 cells in parallel, then you can add 2 wires from the battery pack to the charging module's something like these 1A LI ION Lithium Battery Charging Module Charging Board Charger CC CV Micro USB | eBay , and bingo, you have a usb chargeable battery pack.

     

    NOTE, Because you have 3 batteries connected in parallel, you can expect the batterypack to take approx 24+ Hours to fully charge image via USB, if you have connected to a 1A charger Approx.

     

    Regards,

    GurI

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  • 0

    It is possible to boost the Voltage to a specific charging voltage of the battery at a compromise with current but, The charging will be severely compromised. What do you have in mind when you say charging the laptop battery, I usually use the cells of the battery and charge them using some Standard cheep Li-ion charging modules.

     

    Further, the Battery pack has an inbuilt circuit that has cells connected in series for maximum voltage needed for the Motherboard/LCD as well as it charges individual cells in parallel. I will agree with John Wiltrout charging the batteries using USB But, if you are up to the challenge, You can hack the battery pack and connect all 3 cells in parallel, then you can add 2 wires from the battery pack to the charging module's something like these 1A LI ION Lithium Battery Charging Module Charging Board Charger CC CV Micro USB | eBay , and bingo, you have a usb chargeable battery pack.

     

    NOTE, Because you have 3 batteries connected in parallel, you can expect the batterypack to take approx 24+ Hours to fully charge image via USB, if you have connected to a 1A charger Approx.

     

    Regards,

    GurI

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