Options so far:
Samsung INR18650-30Q 3000mAh - 15A
15A discharge rate, which would be fine at the year of useage, but after 250 cycles the capacity (and max current?) drops to 60%
These cells are 3,40 euro when buying 200
Other option, more expensive but maybe better?
Sony Konion US18650VTC6 3120mAh - 30A
30A discharge, so degrading over time doesn't matter as much (at all)
These are 4,70 euros in bulk of 50 a time
30Q -> 680 euros, i feel like the lifetime of these drops (too) quick, but at the same time 250 cycles of this capacaty could last for +/- 2/3 years and even then it's not dead yet.
Sony konion -> 940 euros, i feel like these would fit the application very well and might serve me a longer lifetime of the battery. But this also comes at a 260 euro price difference. At which point i might be better off buying the Q30's and driving the battery until its dead and then buying a new one.