LEGO-lars:
my 200kg load cell have been standing on my kitchen bench with a constant load for over a week, and it is only drifting like +/- 20g (a little worse when the temperature changes, but not to bad).
Interesting, that's a good start. It sounds more stable than I would have guessed. What % of load capacity is on there?
How about outside in the weather? For a year?
If you could demonstrate ~ +/- 1% of full scale accuracy, while sitting with 50% of rated load for 10 months across temperature changes of +30C to -20C, then I'll be convinced.