Rechargeable Battery (30,000mah) with 8 ft. extension cable

20+ Hour Rechargeable 12v Lithium Polymer Battery Pack with Li-ion Charger and 8 ft. extension cable. Need portable power? This one's for you, middle-of-no-where, no-power in-sight swim coach.     Voltage  12V  Capacity  30000mAh  Input/Output  DC 12.6V / DC 12.6-10.8V  Operating Environment  Charging, 0°C ~ 45°C  Discharging, -20°C~60°C   Storage Environment    Store for >3 months. If you aren't using it, recycle it.Storage temperature: <35°C   Cycle Life  ≥500 times   Advantages  We've tested them to last for over 20+ hours on the highest brightness setting. Lower the brightness and increase your time.  CE certified.  Recyclable at Lowe's or Home Depot Warning Lithium batteries may explode if not used properly. We are not responsible for any damages or losses caused by misusing (included but not limited to: mis-charging, mis-discharging, any changes or modifications to the battery pack, or mis-assembling the battery packs) . Always charge bat