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Use of Rechargeable batteries in Test Equipment

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watchmaker:
I decided to get rid of all my alkaline batteries, even found leaking Energizers in our hiking pack headlamps.

Too many things to keep track of (like emergency headlamps in the Jeeps) and long periods of no use.

First I bought Eneloops which were ok for the AAA headlamps; but the low voltage was too low for the Rx1 in my Simpson 260s using a D cell adapter.  Sent most back to Amazon.

I am now trying BlueSky AAs which have true 1.5 V output for my meters, and will try 9V next.

BlueSky provides a note that the PCB in the battery emits HF radiation, and cautions against using in sensitive devices.

Not too concerned about the VOMs, but what are the limitations for the use of these batteries?

THANKS!

schmitt trigger:
Most likely -but have to verify the assumption- these batteries incorporate a switch mode converter inside. If you have access to a scope I would attempt to view the ripple voltage and how much it changes with load.

I would appreciate if you post a link to the battery supplier. Googling it gives a bunch of irrelevant results.

robert.rozee:
similar situation discussed here:
https://www.eevblog.com/forum/testgear/ansmann-9v-rechargeable-li-ion-battery-in-fluke-87-high-pitched-noise

i'd be inclined to find a solution containing 3 Li-Ion cells in series without any boost converter.


cheers,
rob   :-)

watchmaker:

--- Quote from: schmitt trigger on November 17, 2024, 02:37:31 pm ---Most likely -but have to verify the assumption- these batteries incorporate a switch mode converter inside. If you have access to a scope I would attempt to view the ripple voltage and how much it changes with load.

I would appreciate if you post a link to the battery supplier. Googling it gives a bunch of irrelevant results.

--- End quote ---

Link is here.  The notice was included in the package document.

https://www.amazon.com/dp/B0BT4FTH85?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

unseenninja:
These batteries consist of a single 3.7V lithium ion cell and a buck converter to give the 1.5V output. As the note in the packaging says, they're not suitable for anything which expects the power to be low noise. Most likely there will be many tens to hundreds of millivolts of switching noise on the output.

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