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Battery options for test meters (Brymen)

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wraper:
Another problem with Ni-Zn is that they require a special charger. Also they have capacity rates in mWh, not mAh, and there is a good reason for that, their capacity is rather low and it's a way how make it appear larger.

AVGresponding:

--- Quote from: BillyO on December 02, 2022, 06:11:06 pm ---
--- Quote from: AVGresponding on November 09, 2022, 06:14:58 am ---Ni-Zn rechargeable.

--- End quote ---
These are not only expensive but the voltage on them when fully charged is the same or higher than the Energizer litiums.   Plus, they have a fairly high self-discharge rate so if you are not using your meter often they can be useless when you do and require a re-charge before proceeding.  Add to that if they get too low for too long you can throw them out.

Nice thing about lithiums is the 20 year shelf life.  Even if you don't use your meter for a year or 2 it will likely still work fine.

--- End quote ---

Use whatever suits you   :-//

I use Turnigy brand ones from HobbyKing, they are not particularly expensive, and they last months between charges in my Fluke 289, which is my daily driver at home.




--- Quote from: wraper on December 02, 2022, 06:24:45 pm ---Another problem with Ni-Zn is that they require a special charger. Also they have capacity rates in mWh, not mAh, and there is a good reason for that, their capacity is rather low and it's a way how make it appear larger.

--- End quote ---

They probably use mWh for people that are either too lazy or too stupid to do the maths. The 1500mAh ones I use have only 20% lower mWh capacity than the 2550mAh LSD Ni-MH AAs that I also use.

It's a fair point about the chargers; I've not found one I like yet, and I've been looking a while, so I just use a bench psu.

wraper:

--- Quote from: AVGresponding on December 03, 2022, 08:04:57 am ---The 1500mAh ones I use have only 20% lower mWh capacity than the 2550mAh LSD Ni-MH AAs that I also use.

--- End quote ---
To make use of that mWh capacity switch mode converter is needed. Otherwise it will be wasted, since device will not cunsume less current at higher voltage, and it will be only 58% of usable capacity of NiMH with example above (given that device can use full capacity of NiMH).

AVGresponding:

--- Quote from: wraper on December 03, 2022, 04:59:16 pm ---
--- Quote from: AVGresponding on December 03, 2022, 08:04:57 am ---The 1500mAh ones I use have only 20% lower mWh capacity than the 2550mAh LSD Ni-MH AAs that I also use.

--- End quote ---
To make use of that mWh capacity switch mode converter is needed. Otherwise it will be wasted, since device will not cunsume less current at higher voltage, and it will be only 58% of usable capacity of NiMH with example above (given that device can use full capacity of NiMH).

--- End quote ---

That depends on the device. If it uses linear or no regulation, then yes. If it uses a switcher, then no. Again, I get months of daily use in a Fluke 289, I can't see how that is "poor capacity".

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