12V 12W Waterproof Solar Panel Battery Charger 12v Battery Trickle Charger Maintainer for Car Battery RV

ITEM Car Portable Waterproof Solar Panel Battery Trickle Charger Material ABS Photovoltaic Cell Monocrystalline 18V12W(Maximum Power) Open Circuit Voltage 21.6V Open Circuit 733mA Operating Voltage 18V Operating Current 666mA Conversion Efficiency 19.8%   CONNECTING DIRECTLY TO THE BATTERY Check the polarity of the battery terminals.The positive (POS, P, +) terminal usually has a larger diameter than the negative (NEG, N,-) terminal. Connect the included SAE to Alligator Clip Cable to the battery If the battery is installed in the vehicle, the vehicle ground type must be identified. For a negative-grounded vehicle first connect the positive (red) alligator clip or ring terminal to the positive (POS, P, +) terminal of the battery, and then connect the negative (black) alligator clip or ring terminal to the vehicle chassis or engine block away from the battery For a positive-grounded vehicle, first connect the negative (black) alligat