Need advice from experts for an oscilloscope cmos battery replacement

Thread Starter

Kamel Mohamed_1495119717

Joined May 18, 2017
3
Urgent!

My MTX 3352 digital oscilloscope cmos battery got low and need replacement.

Original battery specs : varta brand Li-Manganese dioxide With PCB solder tags
1/2 AA 3V-950mah, non-rechargeable battery.

Found available on the market : NX brand Lithium-thionyl chloride ER14250 1/2 AA 3.6V 1.2Ah PP (Ref : PCL9005) without solder tags.

Question : Is it risky to use the 3.6V 1.2Ah battery instead of the 3V-950mah ?
If so, do I need to use a diode to drop the +0.7V excess and then what about the +250mah ?
Or is there any simpler and more efficient circuit to fit the 3.6V without risk for my oscilloscope.

Thanks
 

Reloadron

Joined Jan 15, 2015
5,509
Original battery specs : varta brand Li-Manganese dioxide With PCB solder tags
1/2 AA 3V-950mah, non-rechargeable battery.
That is what you want to replace. You try to find the same battery with the solder tabs. Trying to solder tabs to any other battery becomes a nightmare, there is good reason a battery has tabs spot welded on at time of manufacture. Unless you can find a way to spot weld tabs on the similar battery forget soldering.

Just My Take....
Ron
 

Thread Starter

Kamel Mohamed_1495119717

Joined May 18, 2017
3
That is what you want to replace. You try to find the same battery with the solder tabs. Trying to solder tabs to any other battery becomes a nightmare, there is good reason a battery has tabs spot welded on at time of manufacture. Unless you can find a way to spot weld tabs on the similar battery forget soldering.

Just My Take....
Ron
I can fix the new battery without soldering, but I need to confirm whether it is risky to use the 3.6V-1200mah cmos battery instead of the 3V-950mah ?
 

crutschow

Joined Mar 14, 2008
25,129
I can fix the new battery without soldering, but I need to confirm whether it is risky to use the 3.6V-1200mah cmos battery instead of the 3V-950mah ?
I don't think there would be any parts connected to that point that couldn't tolerate 3.6V, so I believe it's okay to use the 3.6V battery in place of the 3.0V.
 

MisterBill2

Joined Jan 23, 2018
6,347
While soldering to a battery is not that hard, the problem is that the heat from soldering is enough to damage the seals and so the battery either leaks or drys out and fails, ruined in either case. So don't solder to the battery. NOW you know WHY!!!
 

Thread Starter

Kamel Mohamed_1495119717

Joined May 18, 2017
3
Thank you for your contribution.

Problem was solved by soldering a 3V Li-Manganese dioxide battery 1200A instead of the 3V-950mah with PCB solder tags, and gluing the battery to the mobo for better security.

Please note that the initial issue was my oscilloscope refused to turn on : it always went to sleep mode, when switched on. Replacing the cmos battery solved the issue. This might help others having same problem.
 
Top