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  1. #1

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    Battery for L248 Seckonic light meter

    I have a Seckonic L248 light meter that takes a PX-13 1.35V battery. When I went to Radio Shack to purchase a new battery they sold me a repacement a 625 whicg is 1.5V. The meter seems to be off, when I check it against my other meter, which is a big clunky Luna Pro. Could thid slight difference in voltage make a difference, and if so where can I get a PX-13??

    Thanks
    Frank

  2. #2

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    please forgive my spelling

    Thanks

    Frank

  3. #3
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    Your meter uses a mercury battery that can no longer be sold in the United States. The alkaline battery that Radio Shack sold you will give the wrong readings. You need to get a “WEIN Cell PX625 Replacement Battery” which is designed to replace the 1.35v PX-13 correctly. You can find it at the US distributor, Micro-Tools. Check their website. It’s at http://www.micro-tools.com/store/ite...temCode=MRB625.

    Ken Fretz

  4. #4

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    What about a 675 zinc air hearing aid battery.........with adjustment?

  5. #5

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    Thanks Ken...I'll contact them Monday.

    Frank

  6. #6

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    The zinc air hearing aid battery I mentioned is very cost efficient.
    Wein cell's are anywhere from $8.00-$15.00 each (depending on the seller).
    #675 Energizer hearing aid batteries cost me $6.50 for a package of 8 and I can buy them from my local grocery store. 1.4 V

  7. #7

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    The blue tab #675s are also available at most Costco's for even way less, around $13 for a card of 30 in Canada.

  8. #8

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    If you search for "mercury battery replacement" you'll find a host of information. You have 3 issues to deal with 1) physical dimensions of the battery, 2) voltage, 3) discharge curve (how the voltage drops over time).

    Alkaline cells decline in voltage over time (as used). Mercury, silver oxide, and zinc air have a constant voltage until they abruptly die. Zinc air batteries don't last long (once the tab is removed) but are cheap. Some devises require a constant voltage; including most meters. You can often compensate for the difference in 1.5 vs 1.35 volts, but difficult to compensate for varying discharge of alkaline cells.

    In general, options are:
    Use a Wein cell, which is a zinc air battery with the proper dimensions (expensive)
    Use a 675 zinc air hearing aid battery and a rubber O-ring (#9 works well). The O-ring brings the 675 battery to the proper diameter.
    Use an adapter such as the one from Cris Camera. Expensive, but a one time cost. Or build one (there are instructions on the web).
    Use a 1.5v silver oxide battery (such as http://www.batterymart.com/p-s625px-...l-battery.html) and compensate for 1.5v.

    Personally, I use the 675 zinc air batteries. One of these days I'll try the silver oxide 625 battery; but I find the quality of the offbrand Chinese made batteries suspect and variable.



 

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