Faulty batteries ?

[d_t_a]

@Lexel

2,000mAh at low load is no problem, problem is internal resistance
modern Laptops draw 5-6A from a battery when they get stressed with CPU and GPU

as a bit more up he measured a cell with 0.65Ohm internal resistance
so even with a moderate load of 2A that cell is dropping 1.3V so even full its already dropping to 2.9V which is about where the Laptop shows you like 5% battery left

a healthy cell has then only 600mAh more but its internal resistance is like 50mOhm so 0.1V drop at 2A

so if you want to know if the battery is good do a capacity test with 3-5A

still a cell which got recovered from overdischarge is not safe even if capacity and internal resistance looks OK

Most analyzing chargers only do capacity discharge at 0.5A to 1.0A. Are there any not-too-expensive ones that does 3-5A testing?

[SentinelAeon]

I ordered this and it seems to do its job ok so far, i am very happy with it:

https://www.ebay.com/itm/18650-Li-ion-Lithium-Lead-acid-Battery-Capacity-Meter-Discharge-Tester-HW-586/172577675238?\_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D57476%26meid%3D4a77df42586042a79be911eda8f3bcd6%26pid%3D100005%26rk%3D2%26rkt%3D12%26mehot%3Dpp%26sd%3D172166617556%26itm%3D172577675238&\_trksid=p2047675.c100005.m1851

[SentinelAeon]

Ok so basicly i need to make some thermal protection. There are 2 choices i have. 1 is connect all 4 ground pins to the same thermal fuse thingy, but i need you to tell me whether this will somehow hinder the charger. The other choices are: 1) use 1 fuse for each of the ground pins and basicly cut power to the pin which overheats or 2) basicly use some ceramic plate and put it over all 4 batteries and if it overheats (meaning 1 or more batteries overheated) cut the power to the litokala 500 completely.

[SentinelAeon]

I could really use this information. If i connect all 4 ground pins on litokala together, is that ok or will i somehow hinder the charging/discharging process ?

[SentinelAeon]

Anyone ?

[snakebite]

sanyo heaters