LiitoKala/Colaier Lii-500 inconsistent IR measurements FIXED

[d_t_a]

@EasyB

@Barkuti

White Paper - Resistance vs impedance @liionbms.com

As you can read there EasyB, 1KHz cell AC impedance is not very useless for our needs. There’s no real correlation between measured values and the actual cell DC figure. For example a 30Q/25R may show ≈30mΩ, this measured value is sum of the actual cell AC impedance (maybe ≈15mΩ) plus contact resistances (another ≈15mΩ more or less).

Sorry if this busts any bubbles.

Cheers 

Do you mean to say AC impedance is not useful for us? That I agree with. But there are meters that display values consistent with the real DC resistance. For example see HKJ’s reviews of the zanflare C4 or the popular opus charger.

I got these measurements using some very old and some new batteries, comparing different chargers:

For more info, see this message thread:

"internal resistance" test comparison of several popular chargers (with summary)

Using some very old AAA NiMh (the Eneloops are 10-years old, the Panasonic may be older) Zanflare C4 [image] Opus BT-C3100 v2.2 [image] SkyRC MC3000 v1.13 firmware [image][image][image] Liitokala Lii-500 Engineer [image][image][image] Miboxer C4-12: [image][image][image] The Zanflare C4, Opus BT-C3100 and SkyRC MC3000 results correlate (for the very high resistance "Panasonic" NiMH, the MC3000 actually usually reads an incorrect "1 mOhm" reading, but was able to capture…