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| Rechargeable 9V batterries for DMM or Alkaline only? |
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| David Hess:
I just use alkaline 9 volt batteries. They last for years so rechargeable batteries do not make a lot of sense. --- Quote from: mariush on November 23, 2022, 08:50:59 pm ---A multimeter consumes a few mA of current, so you could easily have a super tiny voltage doubler circuit on a lithium battery produce around 6-7.5v from 3.7v .. 4.2v --- End quote --- Early Texas Instruments calculators had 1 or 2 AA NiCd battery packs with a small boost converter to produce 9 volts. |
| BillyO:
--- Quote from: Kleinstein on November 24, 2022, 08:30:15 pm ---D-cells are very much running out of favor in many cases. If not careful you may end up with an AA size cell with extra spacer to make it fit the old form factor. An alkaline AA tends to last not as long as a class D dry cell though. Not many new toys / tools use the D-size - it is more like going obsolete: low power devices usually don't need that much capacity and higher power devices tend to use rechargibles. Even with just an external battery, this makes it tricky to keep the isolation barrier with an extra cable / connector. --- End quote --- I try to buy things that only use rechargeable, D or C cells as much as possible. I just hate spending the price of a D cell on a AAA and those 9V batteries are outrageous for the amount of energy in them. TV remotes suck. I guess if the OP is logging data in a CAT IV OR CAT III environment, then isolation might be a thing. Otherwise I'm not sure having a couple of thin wires coming out the back of the meter represents a huge risk. |
| james_s:
9V batteries are my favorite small alkaline, they rarely leak because they have a double casing. NiMH has been good enough for around 15 years though that I generally consider alkaline batteries obsolete. |
| BeBuLamar:
Unless the 9V alkaline leaks I would use it for a DMM. The 9V battery in my Fluke 87V lasts a long time. Rechargeable is very likely to be dead whenever you need to use it. |
| daisizhou:
You can try this DIY solution https://www.mydigit.cn/thread-163962-1-1.html |
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