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60mhom Heater?
#1
I am using my new RC3563 IR tester and have 2 cells which test 50-60 mΩ.
Both cells had a salvage voltage of 3.5V

The cells in my Zanflare C4 began to heat at about 3.9V and never reached fully charged.
Both are IMR18650E21.

My question is why are these cells Heaters at 50 mΩ?
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#2
Maybe have you:
- confirmed the voltages with a separate multimeter, &/or
- are other cells charging OK in the same charger?
Running off solar, DIY & electronics fan :-)
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#3
(05-09-2020, 08:38 AM)Redpacket Wrote: Maybe have you:
- confirmed the voltages with a separate multimeter, &/or
- are other cells charging OK in the same charger?

Voltage is quite accurate and measured the same on other meters including the Tester.
Other cells are testing ok in the same slots etc.
I wonder if the normal IR is supposed to be low like 20mΩ and 60mΩ is considered high for IMR cells?

I have 25 of these cells to test.
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#4
Any chance they're actually LiFePo4 (ie lower voltage, etc?) vs Li-Ion?
Running off solar, DIY & electronics fan :-)
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#5
(05-10-2020, 02:27 PM)Redpacket Wrote: Any chance they're actually LiFePo4 (ie lower voltage, etc?) vs Li-Ion?

The data I have is that they are LiMn2O4 (lithium ion)

My question is about the IR level and still a heater.  While most of the heaters I have check so far with are quite a bit higher.
Is it reasonable for LiFePO4 to be a heater at 60mΩ?
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#6
(05-10-2020, 02:57 PM)Bubba Wrote:
(05-10-2020, 02:27 PM)Redpacket Wrote: Any chance they're actually LiFePo4 (ie lower voltage, etc?) vs Li-Ion?

The data I have is that they are LiMn2O4 (lithium ion)

My question is about the IR level and still a heater.  While most of the heaters I have check so far with are quite a bit higher.
Is it reasonable for LiFePO4 to be a heater at 60mΩ?

I was thinking that if they're actually LiFePo4 they wouldn't be happy being charged past ~3.65V (max for most LiFePo4) & might start heating as you're seeing at ~3.9V

If they are LiMn2O4, should be fine to the usual ~4.2V of course.

Any chance they've seen moisture?

Others might have more experience with strange heaters....?
Running off solar, DIY & electronics fan :-)
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#7
I would suggest charging them, once they start to go heater, remove them from the charger and set them aside for a couple days, and repeat one more time. If they start to go heater again, just discard. It seems that some of the batteries just need a waking up, so to speak, before they start playing nicely again.
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