Hi Gerrybunk,I hope you don’t mind a small hijack,it’s for a good cause,I was where Kodachrome is a year ago.
First the battery pack.It was marked 56watt hours and 11.1volts.There were 6 cells.Ohms law:resistance=volts/amps(R=V/I) and Power(watts)=V*I.
11.1/3.7=3 so strings of 3 cells in series,6 cells so 2 parallel strings.
I=P/V so 56Wh/11.1V==5.05Ah at 11.1V,so 2.5Ah per string at 11.1Vor 2.5Ah at 3.7V per cell.
For internal resistance,HKJ explains it so much better than I can there
We use 2 main types of lithium cell,lithium cobalt(ICR) and lithium manganese(IMR).The IMR’s are for high current drain and have low internal resistance.They are dearer with less capacity,than ICR’s,but are considered safer,so no protection.
ICR’s have optional electronic protection against too low voltage,too high current draw and too high voltige during charging.
Laptop pulls don’t have protection because we left it in the battery case we just distroyed to recover the cells 
AW is a US battery manuacturer,E Fest is chinese.
Panasonic make the NCR18650A and B cells at 3.1Ah and 3.4Ah available protected or un prot/d.The Panasonic NCR18650PF
is a hybrid high drain,low res cell to compete with IMR’s,2.9Ah.The Yezl came with a cheap Yezl torch,as such,it’s not too bad.
Sanyo UR18650FM 2.6Ah has the lowest voltage sag under load of the “normal” cells and can beat some IMR’s,but can’t do high currents.Some of mine were an “as is” batch from fasttechwith the same de solder marks as the pulls.
UltraFire,TrustFire,Fandy,Spider….Fire,well,if 400mohms is dead,these left the factory with wrinkles and a Zimmer frame!
Hope this helps