Schumacher SL1452 Owner's Manual page 8

NOTE: Cold weather may affect the performance of the jump starter's
lithium battery. If you hear only a click and the engine does not turn
over, try the following:
With the jump starter connected to the car battery and the green LED
illuminated on the smart cable, turn on all lights and electrical accessories for
one minute. This draws current from the jump starter and warms the battery.
Now try to crank the engine. If it does not turn over, repeat the procedure.
Extremely cold weather may require two or three battery warmings before
the engine will start.
NOTE: If no activity is detected, the smart cable will automatically shut
off after 90 seconds, and the red and green LEDs will be solid. To reset,
disconnect the clamps from the vehicle battery, and then reconnect.
IMPORTANT: DO NOT attempt to jump start your vehicle more
than three consecutive times. If the vehicle will not start after three
attempts, consult a service technician.
7. After the engine starts, unplug the battery clamps from the jump
starter socket and then disconnect the black clamp (-) and the red
clamp (+), in that order.
8. Recharge the unit as soon as possible after each use.
7.2 CHARGING A MOBILE DEVICE, USING THE USB PORTS
The unit includes two USB output ports. The standard one provides
up to 2.4A at 5V DC. The second is a USB Fast Charging port, which
provides up to 5V at 3A, 9V at 2A or 12V at 1.5A.
1. Consult your mobile device manufacturer for proper charging power
specifications. Connect a mobile device cable to the appropriate USB port.
2. Charging should begin automatically. The display will show which port
is in use.
3. Charging time will vary, based on the mobile device's battery size and
the charging port used.
NOTE: Most devices will charge with any of the USB ports, but may
charge at a slower rate.
NOTE: The USB Fast Charging port requires a specific charging
cable (not included).
4. When finished using the USB port, disconnect the charging cable from
your mobile device and then disconnect the charging cable from the unit.
5. Recharge the unit as soon as possible after each use.
NOTE: If no USB device is connected, power to the USB ports will
automatically shut off after 30 seconds.
7.3 WIRELESS CHARGING (For Qi enabled devices)
The wireless charging pad provides 10W of power to quickly charge
your compatible mobile devices.
1. Consult your mobile device manufacturer to make sure your device
supports wireless charging. Place the compatible device face-up on top of
the charging pad.
2. Charging should begin automatically.
3. When finished charging, remove your mobile device.
4. Recharge the unit as soon as possible after each use.