EZ-Flash II (PowerStar)

Discussion in 'GBA - Flashing Hardware and Software' started by lolboy, Feb 8, 2015.

  1. lolboy
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    lolboy GBAtemp Regular

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    Jul 16, 2009
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    Hi Guys,

    I have a old EZ-Flash II (Powerstar) and it's battery seems to have died. I have some trouble finding a replacement battery.
    It's original battery is "Panasonic VL2020 3v" and finding the exact same battery is a pain in the ass. From what I have understood it's a rechargeable battery.

    After searching I found two versions of it here in Netherlands: "VL2020-1HFE" and "VL2020-1VCE". Which one do I need ?

    Can I also use other brand/type batteries ? I really don't care about the recharge feature.


    Thank you very much!


    Edit: Sorry mods, just noticed that there is a EZ Flash section :(
     
  2. FAST6191

    FAST6191 Techromancer

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    Nov 21, 2005
    Moved the thread.

    We will break it down then
    Panasonic. Company name but does give sense to the letters to follow
    VL- Panasonic's code for Lithium rechargeable batteries
    2020 gets broken down twice more and is reasonably standard across most coin/button cell manufacturers/vendors.
    20 is a rounded down diameter in mm (20 in this case but 24 often means 24.5)
    the final 20 is the thickness in mm if you put a decimal point between the two numbers (2.0mm in this case)

    The bigger trick is finding one with tags welded on in the proper arrangement. You could get fancy with the hot glue and wires I guess but tags are preferable.

    Being size values if you can find something of the same voltage that fits in there and has a reasonable charge capacity (or your are willing to stick it in the linker to charge more often) then by all means solder it in.

    I did see some of these batteries, even with the tags in a somewhat suitable arrangement, got used in a car remote (some BMW if memory serves) which pumped the price up on the likes of ebay and amazon (people will pay something silly like $15 to get their key fob, or even keys in general, working again if the alternative is $70 from a main dealer) but does mean you can get them from non electronics suppliers these days.

    Also you do care about recharge for this -- when a flash cart is just holding SRAM saves it can last for ages, when it is also doing real time clock it is more troubling. With that said it should be noted that the EZ2 has no specialist charge management* on it beyond a diode so if your battery can handle a constant input of the voltage in question (entirely possible) and charge/not die/not blow up in your face then go for it.

    *battery chemistry and charge management is a complex and boring subject, though eevblog 176 is a nice intro to an aspect of it all if you are so inclined. http://industrial.panasonic.com/www-data/pdf/AAA4000/AAA4000PE16.pdf being the one for the battery in question.

    "VL2020-1HFE" and "VL2020-1VCE" just for the sake of completeness refer to the types of welded tags on them, neither would seem to be the type of tags used on the EZ4, the 1VCE being the closest (for forum searchers it is also called the VL-2020/VCN in some places). but the tags will be spread apart compared to the normal EZ2 so you will have to solder a jumper wire. I can not seem to the find the relevant one on Panasonic's website right now, however I am not looking at any retired models. Annoyingly for you (and likely me if I bother to replace mine any time in the future) is the smaller sizes and bigger sizes come with the sort of tags you want for this ( http://www.digikey.com/product-sear...ee=0&rohs=0&quantity=&ptm=0&fid=0&pageSize=50 ). Capacity wise it is about half but that should still be reasonable.
     
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  3. lolboy
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    lolboy GBAtemp Regular

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    Jul 16, 2009
    Netherlands
    Thank you very much for the explanation, i have learned alot!

    Saying that I hope someone has also dealt with this problem and share with me wich alternative battries he or she tried.
    I am not looking forward for the thing to blow up in my face haha.
     
  4. FAST6191

    FAST6191 Techromancer

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    Batteries will not tend to blow up in your face unless you puncture them, burn them or put silly voltages into them. However some chemistries do need proper charge management to get the best lifetime out of them -- the video would have covered some of the stuff where you have to monitor temperatures, do constant current if you fall below a certain voltage, do different durations at different voltages.... many will still charge from a constant voltage at about their nominal one but it will not last the longest time or most charge cycles if you do that.
     
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