Question Battery Low Indicator?

Discussion in 'Nintendo 64' started by Lab Minion, Sep 13, 2019.

  1. Lab Minion .

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    I've got my N64 portable running on the bench with batteries now. I'm using this BMS (CX-74-2S):
    https://www.ebay.com/itm/Intelligent...2S-Packs-18650-lithium-Satellite/311721987212 . It doesn't have a gas gauge nor battery low indicator from what I can tell.

    I prefer not to use one of those pushbutton battery level gauges since it would be easy to forget to check when you are playing. My preference is to have a simple LED light up when the voltage of the battery drops below (for instance) 7V. This can be achieved with a voltage reference (EG: TL431) and resistors, but it tends to burn quite a bit of current due to resistors.

    So, I was wondering what other's are doing to provide some sort of low battery indicator.
    Thank you for the pro tips!
     
  2. Gman RTFDS Staff Member . . . . .

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    Hello. The N64PMS board is for sale in the store. It eliminates the need for the BMS board and the PTH08080 regulator. It provides play/charge capabilities, custom regulators, a battery monitor for low battery indication, and other neat features.
     
    Stitches likes this.
  3. TodorSauce The artist formerly known as Ashen .

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    low batt.png

    All credit to Daftmike and Mario.
     
  4. Lab Minion .

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    Thank you both! I tried out the circuit and calibrated R4 for 7.0V and it works nicely.
     
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  5. Arceus .

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    This circuit seems nice, i definitively going to use it.
     

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