Ensure the charger is powered off (or unplugged) before connecting to the battery. Connect the DC output connector (the large industrial plug) firmly to the battery receptacle. Ensure a tight fit; loose connections cause arcing and connector damage.

This feature guide is based on the standard specifications for the TGC BC-90 series. Specific voltage inputs and safety protocols may vary based on the year of manufacture. Always consult the physical label on your specific unit or contact the manufacturer for definitive safety data.