Electronics > Projects, Designs, and Technical Stuff

good 9V battery

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bluey:
My Fluke 87 V1 runs fine on 8.4V Nimh, Toshiba.

ali6x944:
this might be of interest:

 

HKJ:
There are two ways to make 9V batteries with LiIon cell:
1) A single cell or parallel cells (good for USB charging).
2) Two cells in series (Can be (more or less) charged on a standard 9V charger).

I have reviewed both types and done a tear down: https://lygte-info.dk/info/BatteryDisassembly9VLiIon%20UK.html

wizard69:
I see the ugly of alkaline batteries has turned up again.   What I'm wondering is what it would take for a company like Fluke, Keysight or whomever to switch over to 16850 cells?   Far too many instruments end up in the recycle bin due to alkaline batteries leaking.   I realize that the various 16850 chemistries complicate the usage some what but properly sized they should be a better solution than alkalines.

coppercone2:
if you have a suspicious instrument connect it to a lab power supply to see what it draws when its turned off. Sometimes things break so they use more current then normal and they will kill any battery.. it might just need a repair

So say you have a 1500mAH cell. If its drawing 1mA quiescent you will run it out in less then a year and have it explode. 100 microamps will drain it in 1.5 years, if you go by the REALLY basic explanation. Some designers don't know what their doing here. There is a limit of course because the battery has self discharge and you can only push the envelope so much before it becomes useless to lower current further.  If you leave it and drains a battery to nothing, of course it will leak. IMO 18650 is a bazooka solution. It might just hide the problem.

https://www.digikey.com/en/articles/take-advantage-of-ic-load-switches-features-to-safely-minimize-power-consumption

A good design of a soft switch instrument should only draw like <5uA.

Keep this in mind when you buy battery powered devices off ebay. They might be selling it because it started to kill batteries fast and it pissed someone off. It is a super big trap because people might just do a quick test with a power supply that has a 1mA resolution.. and 0 does not mean much here when talking batteries. If its drawing 1mA, it should kill the battery in only 2 months.

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