12.6V Lithium Ion Battery FOR HS-1B

Discussion in 'QRP Corner' started by BG7IKK, Jul 4, 2019.

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  1. BG7IKK

    BG7IKK Ham Member QRZ Page

    3* Sanyo 18650GA 3500mAH lithium ion batteries are used. The internal resistance of each cell is about 22 milliohms in good consistency. The batteries have been welded in three series, with protective plates and good insulation and plastic sealing. The foam board is attached to the transceiver circuit board to prevent collision and swing, and close the shell. Do it! Then the special 12.6V lithium battery charger is connected for pre-charging. You can always take this QRP CW amateur transceiver out to play in the future.
  2. BG7IKK

    BG7IKK Ham Member QRZ Page

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    KC8VWM and W7CJD like this.
  3. KL7KN

    KL7KN Ham Member QRZ Page

    A related note - just as the HS-1A became the MFJ-9200, the HS-1B is sold today as the (new) HB-1B
  4. KC8VWM

    KC8VWM Ham Member QRZ Page

    Nice work. :)
  5. KF5LJW

    KF5LJW Ham Member QRZ Page

    Just one issue, it is NOT 12.6 Volts, it is 10.8 volts nominal and not compatible with 12 volt systems. It is a Nickel Cobalt lithium cell.
  6. BG7IKK

    BG7IKK Ham Member QRZ Page

  7. KF5LJW

    KF5LJW Ham Member QRZ Page

    Wrong, very wrong. Your cell nominal voltage is 3.6 volts x 3 = 10. 8 volts all day long. 4.2 is the charge voltage. As soon as you bleed off the surface charge in a matter of minutes the voltage will drop to 11 volts, and be discharge to 7.5 volts.

    The only lithium ion battery compatible with Pb 12 volt systems is LiFePO4 aka LFP with a nominal voltage of 3.2 volts per cell, and requires 4S configuration. With LFP nominal voltage is 4 x 3.2 volts = 12.8 volts. If you are running a 12 volt radio or gizmo, roughly 80 to 90% of the capacity cannot be used because the voltage will be roughly 10.8 volts despite being nearly full charged. Yack all you want, but you used the wrong lithium ion battery chemistry.

    By your logic a 12 volt PB battery would be 14.6 volts because that is what it is charged up to. Soon as you take a Pb battery off the charger and bleed of the surface charge will be 12.4 to 12.6 volts.
    Last edited: Jul 20, 2019
    KD0CAC likes this.

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