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| Batteries for handheld test gear. |
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| J-R:
Typical lithium-ion 9V batteries that leverage two pouch cells in series plus a BMS circuit are about 600mAh, which is very similar to alkaline under low-discharge rates (10mA or so). Of course alkaline has the known weakness of losing lots of capacity when consumed at higher rates. So any comparisons will depend on the equipment they are installed in. Lithium-ion 9V batteries that claim higher capacities are just lying, and some are much lower in practice. IMHO based on the volume the most you could hope for in the PP3 form factor after eliminating any circuitry would be maybe 750mAh. EBL has been mentioned as a reasonably good brand. I purchased four direct and one has gone bad after a year, however. |
| AVGresponding:
--- Quote from: J-R on June 25, 2023, 04:31:33 am ---Typical lithium-ion 9V batteries that leverage two pouch cells in series plus a BMS circuit are about 600mAh, which is very similar to alkaline under low-discharge rates (10mA or so). Of course alkaline has the known weakness of losing lots of capacity when consumed at higher rates. So any comparisons will depend on the equipment they are installed in. Lithium-ion 9V batteries that claim higher capacities are just lying, and some are much lower in practice. IMHO based on the volume the most you could hope for in the PP3 form factor after eliminating any circuitry would be maybe 750mAh. EBL has been mentioned as a reasonably good brand. I purchased four direct and one has gone bad after a year, however. --- End quote --- Did you return it under warranty, or tear it down to investigate? |
| alm:
I use low self discharge NiMH batteries in battery powered test equipment like DMMs. The 9V models won't have the capacity of Li-Ion batteries, but are much simpler and last plenty long with low power draw (10mA is not low for a 9V battery) handheld equipment. For very low draw equipment I use primary lithium batteries. |
| iJoseph2:
I've been using these in my Fluke 70 series meters... https://lygte-info.dk/review/batteries9V/Soshine%209V%20LiIon%20650mAh%20(White)%20UK.html Probably ordered from here ... https://www.aliexpress.com/item/32808238857.html It's been about 2 years since I installed them .. which reminds me I should probably at least have a look at them physically. |
| BillyO:
--- Quote from: iJoseph2 on June 25, 2023, 10:53:44 am ---I've been using these in my Fluke 70 series meters... https://lygte-info.dk/review/batteries9V/Soshine%209V%20LiIon%20650mAh%20(White)%20UK.html Probably ordered from here ... https://www.aliexpress.com/item/32808238857.html It's been about 2 years since I installed them .. which reminds me I should probably at least have a look at them physically. --- End quote --- What do you use to charge them? |
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