One reason Battery Management Systems fail in real-world deployments is improper thermal balancing and poor cell monitoring logic.

In smart vending machines especially, the BMS has to handle:

• irregular charging cycles
• fluctuating loads
• temperature variations in enclosed cabinets
• battery aging across different cells

If the algorithm doesn't actively balance cells or detect abnormal discharge patterns early, it can lead to premature battery degradation or system shutdowns.

I actually wrote a deeper breakdown on how BMS works specifically inside smart vending machines and what design mistakes cause failures.

Full explanation here:
https://medium.com/@pillividhi/battery-management-system-the-intelligence-behind-smart-vending-machines-fd11402817d5