When I reviewed this battery charger, I questioned whether the cell internal resistance check was reliable. I tested a range of Li-Ion cells, from eBay cheapies to quality protected cells, but I didn't test any quality unprotected cells. The results were all high internal resistance of around 125 milliohms. But the charger does detect the low internal resistance of an Efest 2250mAh Li-Mn cell.
By Julian
Youtuber, shed dweller, solar charge controller aficionado
They don't have feelings. YOU are what destroys it Not the cell PEACE
The circuit protects the battery from you
Protected cells suck period
I also had cells with 100 mohm resistance measurements. I licked the ends of the cell and re-installed, the resistance dropped to 10 mohm. So I'm starting to thing that it is the contact resistance that the device is mostly measuring.
Be interesting to try some ex Mr Dyson cells
There's something fishy about this tester.
I just picked up the Lii-500 4 bay charger without the power supply from AliiExpress. With my unprotected Panasonic's, I'm getting a reading of 10 to 20 milliohms. Not sure how accurate those readings are, but it's a nice feature to have. So far I'm quite pleased with it. Batteries come off the charger at 4.19 volts. On the other hand, my Lii-100 overcharges a little at 4.25 on average. I'm not too pleased with that.
by the way you pronouncing liitokala sounds reilly funny
umm littoKala?????????????????
Ahahahahahhahahahahahah that translate 😀
would have to get one and test it with various cells, but it seems like 125 mR is the highest you are getting. Maybe the active circuitry in the protected cells are not allowing it to actually calculate the internal resistance, so it is defaulting to the highest setting for safety.
Thank you for a great test of this flying fish. lol, Yea Ulrafires are very low quality. cool review of the milliohm observations as well.
Working with high current LED drivers, I came across a white paper about using the known internal resistance of a mosfet transistor as the current measuring resistor, rather than an expensive high wattage precision resistor… could be the way a protection chip measures current as well.
typo in video title, you've got a tt instead of ii
Had one of these for over a year now – good charger. The milliohm scale will go much higher than 125 (seen 700-800 readings). Only problem I've had is sometimes the cell protection circuit turns off the connection before the charger's cell protection circuit has determined the end of charge and the result is a "null" reading when charged.
I frequently hear about poor quality 18650 batteries (ie: fake ebay cheepies), but seldom hear about the good batteries. Would love to hear your thoughts/recommendations/sources for the good ones (if there are any)…plz share this if you will. Thank you for the outstanding videos you provide.
Hi,
Do you get the same readings from the other charger terminal? Thanks
liitokala, liito kala, stands for flying fish