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| Batteries for handheld test gear. |
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| J-R:
The failed EBL would only charge to approximately 8V, then it would disconnect. Working units disconnect at just above 8.4V. After disassembly, I found one cell at 3.8V and the other at 4.2V. |
| AVGresponding:
--- Quote from: J-R on June 26, 2023, 03:23:10 am ---The failed EBL would only charge to approximately 8V, then it would disconnect. Working units disconnect at just above 8.4V. After disassembly, I found one cell at 3.8V and the other at 4.2V. --- End quote --- The Znter brand ones have a single cell; Big Clive has taken one apart. It's quite disappointing that the EBL one can't balance its cells properly, is there a charge controller, or are they relying on individual cell protection boards to just cut them off at 4.2v? |
| Berni:
Yep Lithium cells are a good idea. I use the "Philips Lithium Ultra" cells in my DMMs. They do last longer, but the difference in capacity is i think about 2x while they cost 3x. So they are not really a way of saving money, especially if you compare them to the cheep store brand alkaline cells. But the AA cells last a really long time in a DMM so i don't care about the extra cost. The real reason i do it is that they never leak. The DMMs are rather expensive so i am willing to pay extra for a battery that will not destroy it by barfing electrolyte all over its insides. Alkaline cells leak no matter what the brand, even ones that claim "Anti leak" on the package. Some brands are significantly less leak prone than others, but they still leak if you are unlucky enough. If the goal is to save money they go for rechargeable Ni-MH. The modern ones have self discharge rates low enough to be usable for this and after a dozen or so recharges they will pay for themselves in not needing to buy new batteries. The capacity does take a hit, but then again the battery life of 9V powered DMMs was never that great to begin with anyway (that's why all of mine are AA or AAA now). |
| iJoseph2:
--- Quote from: BillyO on June 25, 2023, 02:02:02 pm --- --- 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? --- End quote --- Hi @BillyO, apologies for not getting back .. I completely forgot I posted that and been far too busy working. Originally I got a soshine charger with them and used that at first, but then I saw a youtube video about them potentially killing the internal BMS circuit .. .. so got a Nikon battery charger and fitted a 9v clip .. then realised 550mA (about 1C) is probably too much for these, so got a lower current (120mA) Nikon charger (yet to be modified). Until I sort that out I've been using a bench power supply limited voltage to 8.0 to 8.4v (depending how full I want them) and current limited to 100mA Joseph |
| iJoseph2:
I've noticed Soshine have updated their stock .. The last one is probably one 1000mah 3.7v cell hence the bigger number. 680mAh: https://www.aliexpress.com/item/1005005544326394.html 500mAh USB: https://www.aliexpress.com/item/1005006240308560.html 1000mAh USB Constant Volt: https://www.aliexpress.com/item/1005005921997945.html |
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