As far as I know, there are only two companies with experience in bulk supply in the market at present, the specific model is ER26500+HPC 1520 (E-dimension is SPC 1520). This is the main model of the Internet of Things water meter. Our company has used 654.38 million sets this year, and both companies have them, not to mention who has more and who has less. So far, the performance is not bad.
Considering the high peak current of equipment based on NB-IoT communication, the manufacturer recommended the combination of battery and capacitor in our selection stage, and specially sent technicians to help debug and explain how to use it scientifically. It must be said that the current state-owned enterprises are under great pressure to survive and their services are improving day by day.
The basic answer is finished, I hope to adopt it!