Electronics > Projects, Designs, and Technical Stuff
good 9V battery
Pawelr98:
--- Quote from: coppercone2 on July 06, 2020, 04:56:09 am ---The analogy I get between 18650s used in lower power devices is like a word processor now requiring a super computer to run
--- End quote ---
I just use 18650 cells for everything that may require a battery change too often.
18650 cells are plentiful and inexpensive.
Electronic projects, radios, multimeters.
On low power devices I just run them for months , throw them on a charger once in a while (no matter what charge) and swap them with other devices that require more power.
Each cells should see more/less the same wear over time.
Even an analog oscilloscope I can run on 4x18650 + boost converter.
Scope requires around 500mA at 28V.
Comes handy in places where there's no mains available or when measuring mains-referenced voltages of various power converters (welders, VFD).
It also comes with a DMM function.
I'm the kind of person who solders an AA battery socket in the place of a button cell.
No need to keep around few types of batteries, low power device basically runs forever and replacement battery can be purchased anywhere.
David Hess:
--- Quote from: Alex Eisenhut on July 06, 2020, 12:07:42 pm ---
--- Quote from: David Hess on July 06, 2020, 11:22:45 am ---
--- Quote from: Alex Eisenhut on March 25, 2017, 01:13:15 pm ---I can't believe that in the 21st century we are unable to build a 9V battery that lasts more than a few months in a DMM.
--- End quote ---
We solved this problem in the 1980s with multimeters which operated for 2000 hours or more using the same 9V batteries that we have today. It is not the battery's fault that you bought a junk multimeter.
--- End quote ---
OK how do I return my Tektronix DMM249? Obviously Duracell makes a quality battery, so that's not the problem... ::)
Ever since using alkaline batteries from the dollar store, my multimeter secretly redesigned itself at night using components it found on the floor. No more dead 0V batteries.
--- End quote ---
And I have a Tektronix DMM916 but these are later instruments which have shorter battery life.
james_s:
Interesting, that Panasonic battery uses a plastic top end and metal bottom cap. Most 9V batteries use fiber for one or both of these, I think that absorbs a fair amount of any electrolyte that leaks.
teddychn:
--- Quote from: tooki on March 26, 2017, 04:06:48 pm ---
--- Quote from: ali6x944 on March 26, 2017, 01:00:05 pm ---I generally try to avoid the use of alkali cells because of their horrible leakage and crystallization problems...
So I would rather use a rechargeable battery or carbon-zinc battery aka heavy duty batteries because they are less prone to those problems and for carbon-zinc batteries they are much cheaper that alkaline batteries.
But it must be noted that the average capacity of the carbon-zinc batteries is a fraction of the poorest preforming alkaline...
A good source of info in this subject is this website:
http://rightbattery.com
--- End quote ---
Alkaline batteries leak when deep-discharged (And even then, not all brands leak as often. Duracell is the worst in this regard.). As long as you remove them when empty, they're fine.
--- End quote ---
Actually I bumped into a crystallized battery issues with unused Toshiba and Duracell's AAA akaline batteries. Both of them were slept in the drawer for less than a year.
So I guess this may not be a deep-discharged issue.
When I was a child. The cheap carbon-zinc battery always got leak problem. But I didn't see any similar problems on the akaline batteris which came out later. But the situation
are reversed now. I'm not pretty sure whether the carbon-zinc batteries are more stable than the akaline ones nowadays. Because I replaced most of my AA/AAA batteries to
rechargeable NiMH ones.
Since my experience is that some very old devices never get battery leakage issue, and many new devices always get this kind of proble. My suspection is that the leakage issue
might relate to the chemical reaction between batteries to some metal contacts.
coppercone2:
--- Quote from: Pawelr98 on July 06, 2020, 07:52:54 pm ---
--- Quote from: coppercone2 on July 06, 2020, 04:56:09 am ---The analogy I get between 18650s used in lower power devices is like a word processor now requiring a super computer to run
--- End quote ---
I just use 18650 cells for everything that may require a battery change too often.
18650 cells are plentiful and inexpensive.
Electronic projects, radios, multimeters.
On low power devices I just run them for months , throw them on a charger once in a while (no matter what charge) and swap them with other devices that require more power.
Each cells should see more/less the same wear over time.
Even an analog oscilloscope I can run on 4x18650 + boost converter.
Scope requires around 500mA at 28V.
Comes handy in places where there's no mains available or when measuring mains-referenced voltages of various power converters (welders, VFD).
It also comes with a DMM function.
I'm the kind of person who solders an AA battery socket in the place of a button cell.
No need to keep around few types of batteries, low power device basically runs forever and replacement battery can be purchased anywhere.
--- End quote ---
bazooka vs fly
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