Yes, the Tadiran is a primary cell, and gets it's high capacity from having a very porous graphite anode, which has a high capacity, but as well a high internal impedance. Thus the low current rating, but it does have a long life and very low leakage. Thus it is intended for low current use.
I have a Crompton Eternacell here, that expired probably 5 years ago, but which still has some capacity remaining. Made in the UK by Hawker Siddeley, and probably will still have some life in it after another 5 years. I stopped using it as it's internal resistance was too high, and even with a 2200uf capacitor in parallel with it it would not supply a 10mA pulsed load.
