where do I get these

Discussion in 'General Electronics Chat' started by thatlevi, Jun 17, 2013.

  1. thatlevi

    Thread Starter New Member

    Jun 17, 2013
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    0
    Hello, I'm new here
    I am rebiulding my cordless drill batteries (hilti battery packs sfb155 3.0ah)
    I can't find 4/5a NIMH batteries with a 3.0ah can anyone tell me where I might find them or an idea of what difference in 2.0ah to 3.0ah I will see.
    I can find 2.0ah batteries I am willing to use those, but I am trying to stay original as posible

    Thanks in advance
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    760
    3.0ah or 3AH means the capacity of the battery.

    3A stands for 3 Amps and H means hour.
    In short the battery can supply 3 Amps for 1 hour or 1 Amps for 3 hours.
    Loading at high currents greater than 3amps is not advisable but for 0.5hours it can supply 6 amps.

    I hope u get the point.

    So, ur 2.0ah battery will run out a bit faster than the 3.0ah one. Provided the output voltage is same.

    If the Voltage and sizes are same you can replace the battery. But it will last shorter and u will need to recharge at a sooner pace.
     
  3. thatlevi

    Thread Starter New Member

    Jun 17, 2013
    2
    0
    Thank you I understand much better now.
     
  4. gerty

    AAC Fanatic!

    Aug 30, 2007
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    This is who I've used in the past. I don't think they sell individual cells(you can check), but I've had them rebuild battery packs for me with excellent results.
    http://www.primecell.com/index.html
     
  5. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Most AH ratings are based on 0.1 x A draw for 10 x hours. 3AH batters are based on a 300mA draw for a 10Hr test. Don't expect a 3AH battery to draw 3A for 1Hr or even 1A for 3Hr.

    Ken
     
  6. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    No kiddin ! :eek:
    Well tht changed a lot.
     
  7. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Like I said, KMoffett confused me all the way.
    Recently I did some calculation and I am way confused now.

    U see it was just yesterday I installed a 1KW inverter with a 12VDC 200AH SLA.
    So as u say the battery is 20Amps for 10Hrs. OK makes sense.

    Tell me KMoffett, if the inverter draws 50 Amps, how long will the battery last?
    Right now with the current load the bat low alarms goes off in 1.5Hrs. Any way to determine the current draw.?
     
  8. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    I would go back to the battery manufacturer and check their Discharge curves. Better from the horses mouth.

    Ken
     
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