Astro 6300 Cordless LED Inspection Battery Replacement

Discussion in 'General Electronics Chat' started by Gdrumm, Nov 30, 2014.

  1. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
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    Batttery Pack is Greenpow 4x4 / 3A 3300MAH 4.8v
    Nimh

    Can i build my own using 4 of these?
    Thanks, Gary
    Sorry the photo is upside down. [​IMG]
     
  2. ISB123

    Well-Known Member

    May 21, 2014
    1,239
    527
    At what voltage is that thing working at?
     
  3. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
    684
    36
    The battery pack reads 4.8v.

    There are four cells connected together in a green plastic cover that reads:
    Greenpow 4x4 / 3A 3300MAH 4.8v Nimh
    However, the charger for the thing shows an output of 11 + volts, when I put my meter on it.

    My initial concern was the 3300 mah (original), vs 2500 mah as seen in the Ebay photo (of a single cell).
    The Ebay cells (photo) are $1.00 each.
    A comperable battery pack to the original is about $16.00

    My understanding is that lower mah, will cause the batteries to drain quicker.
    But if 2500 mah will power the LED,s even for 30-40 minutes, that should meet my needs.

    Thanks for the reply

    Gary
     
  4. paulktreg

    Distinguished Member

    Jun 2, 2008
    611
    120
    You'll be OK but your 2500mAh batteries will only last for approximately 70% of the time of your 3300mAh batteries.

    The 11V ia a little worrying as NiMH batteries are best charged at 1.4~1.6V per cell which equates to 5.6~6.4V in total but I presume your measured voltage is with no batteries connected?
     
  5. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
    684
    36
    Paul,

    Correct, I measured it with no batteries connected.
    70% will be fine for my hobbiest application.


    Thanks for the feedback.

    Gary
     
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