Because the BX60 is a manual charger, it can "overcharge" a battery if left unattended for too long, which may lead to overheating or the release of flammable hydrogen gas. The manual strictly warns against: Charging in unventilated areas. Smoking or creating sparks near the battery. Attempting to charge frozen or damaged batteries. Maintenance and Troubleshooting
The core of the manual focuses on the sequence of connection to prevent sparking or short circuits:
