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Old 05-20-2008, 09:51 AM
morrisma's Avatar
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Accu-check Aviva Internal Battery Defeat

Dewey closed the thread for getting off topic but I had an idea I was hoping might help so I am posting in this new thread:

I wonder if you could reset the internal clock without soldering or taking the thing apart.
Possibility #1: Try removing the user battery and waiting until the internal battery died (several days maybe) or
Possibility #2: Try shorting the user battery terminals for a few minutes (battery removed of course) to rush the discharge of the internal battery. With the user battery out, use a paper clip to connect the metal tabs where the plus & minus of the user battery would touch.

Seems like a fun project to defeat the meter masters. If I had such a meter I would try it myself.
Mike
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Old 05-20-2008, 11:28 AM
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Quote:
Originally Posted by morrisma View Post
I wonder if you could reset the internal clock without soldering or taking the thing apart.
Possibility #1: Try removing the user battery and waiting until the internal battery died (several days maybe) or
Possibility #2: Try shorting the user battery terminals for a few minutes (battery removed of course) to rush the discharge of the internal battery. With the user battery out, use a paper clip to connect the metal tabs where the plus & minus of the user battery would touch.

Seems like a fun project to defeat the meter masters. If I had such a meter I would try it myself.
Mike
#1 The user battery usually does not recharge the internal battery. It is used to keep the data in the EPROM. Like on a desk top when the mother board battery dies it needs to be replaced.

#2 Undesirable things happen when you short out batteries. Sometimes they can actually blow up. Shorting it out tries to release all of the stored energy at once and it creates a lot of heat.
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Old 05-20-2008, 12:31 PM
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Harold,
I guess I was hoping the internal battery was being charged by the user battery and would therefore be protected from rapid discharge by an internal resistor as part of the charging circuit.

If that is not the case, it still shouldn't hurt anything to short the user battery clip without the user battery in there. If I was very nervous, I'd use a 1k resistor to do the shorting.

Seems a shame that the only way to beat the thing is with a screwdriver and soldering iron. Don't mind the work, just always looking for shortcuts.

I program stuff for a living and I'd also bet there could be some code entry that would allow you to bypass or defeat the internal check system. Maybe I can find something online in newsgroups. The game is afoot!
Mike
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Old 05-20-2008, 06:15 PM
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ahh the wonders of the inter webnet where would we be without it? I can't really offer any advice on this seeing as i'm #1 stoopid
#2 lazy
#3 really stoopid
keep us informed
Azz
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Old 05-22-2008, 12:36 AM
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Thanks for your support Harold. I already tried the possiblities of #1+2 posted by morrisma, (diode, thermister).
It was real quiet before I made my first post. I'm glad it is closed now. I'm was afraid to get back in. Maybe I have started it.
oh! I think I can make the average cost of the $1 test strips reuseable.
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