The swelling of batteries is a physical issue caused mainly by over-heating. Please consult the best practices document for some actions recommended to reduce the amount of heat and impact:

• Place the devices in a non-flammable, well-ventilated enclosure
• Provide extra ventilation for the enclosure
• Maintain enough space between the devices to prevent them from overheating
• Reduce device screen brightness to a minimum to avoid excessive heat and screen damage
• Use only the original USB cables supplied with the phones

Preferably they should store the devices in a cool, dry environment.

I would also suggest configuring System monitoring to keep track of the health of the devices.

Thank you for your reply. We will follow the best practices guide on this.