battery and charger

Discussion in 'Chit Chat' started by Pasta88, Oct 30, 2019.

  1. Pasta88

    Pasta88 MDL Expert

    Jun 17, 2009
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  2. Joe C

    Joe C MDL Guru

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    #2 Joe C, Oct 30, 2019
    Last edited: Oct 30, 2019
    The charger and battery are rated for 12 volts. The 1250mA on the charger is rated in milli-amps. Which really means it charges @ 1.25 amps.
    The battery description does state it is rechargeable. Stand by and cycle use do not matter because you would not be using this charger while it is in use anyway. It should work, but it will be a very slow charger.

    A decent (cheap) charger and you can use it for for car if needed ...
    https://www.amazon.com/dp/B079C5SZ2H/ref=psdc_15707061_t2_B0797XMSDL
     
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  3. kaljukass

    kaljukass MDL Expert

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    The normal charging current for such a lead-acid battery is one-tenth of the nominal capacitance, i.e. in this case the nominal capacitance is 5AH, then the recommended maximum charging current should not exceed 0.5A ( or 500mA). This applies to normal charging. In the short term, the charging current may go higher, this is used on so-called pulse chargers.
    The charger, you provide, allows for a maximum charging with 1.25A, but that does not mean that charging will go with that current all time.
    This maximum possible.
    Charging current is likely to be several times lower, as determined by the internal resistance of the battery (do you know what it is?).
    So, this charger is okay, but you need to make sure the battery does not get hot while charging. If it is slightly warm to the touch with hand it is normal.
     
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  4. Pasta88

    Pasta88 MDL Expert

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    So in simple terms, Is it compatible plz?
     
  5. kaljukass

    kaljukass MDL Expert

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    Yes, if you want to charge the battery mentioned in the first post, then it seems to fit.
     
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  6. Pasta88

    Pasta88 MDL Expert

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    TYVM
     
  7. Enthousiast

    Enthousiast MDL Tester

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    #7 Enthousiast, Oct 30, 2019
    Last edited: Oct 30, 2019
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  8. Joe C

    Joe C MDL Guru

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    That charger on ebay also has no safety factors built in. It will continuously charge no matter the state of charge in the battery. So do please get a smoke detector with that charger as Enth suggests, cause your going to need it. That ebay charger lacks the safety features to one I linked to:
    • Microprocessor-controlled to automatically adjusts amperage rate, to charge and maintain
    • Easy to use with Start/Stop interface, LED indicators and push button controls
    • Reverse hook-up protection ensures charger will not operate if clamps are reversed
    • Rugged, heavy-duty metal case
    • Charges compatible battery types, including standard, AGM and gel batteries
     
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  9. kaljukass

    kaljukass MDL Expert

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    Please explain how is this possible?
    (My special education is physicist-electronicsist and I have never heard something similar before.)
     
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  10. Enthousiast

    Enthousiast MDL Tester

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    I wouldn't trust you with the job of exchanging the batteries in my tv remote, physicist my ass.
     
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