If I leave the usb charger connected, does it drain the battery when it’s not in use (i.e. no usb cable or device is plugged in)?

No, it will not drain the battery if no usb device is connected to it.

Is this product compatible with Lithium power sport batteries?

Yes, but make sure you use a correct charger if that is your plan. Why would you think a cable would not be compatible when used with a battery of similar voltage?

Can i hook a solar panel to the usb port to charge my battery?

The USB will only work off of your 12 volt battery using the ring harness (accessory cable). The solar panel is designed to connect directly to the 12 volt battery by way of ring harness (accessory cable). Our solar panels will not provide a change until it is connected to a 12volt automotive style battery that has at least 3 volts. Customer Service Deltran USA

ASIN	B08CBQYXY5
Additional Features	Fast Charging
Amperage	7.5 Amps
Brand	Battery Tender
Built-In Media	Ring Terminal Cable, USB Charger Adaptor
Color	black
Compatible Devices	Laptops, Smartphones, Tablets
Compatible Phone Models	Compatible with all USB phone chargers.
Compatible devices	Laptops, Smartphones, Tablets
Compatible phone models	Compatible with all USB phone chargers.
Connectivity Technology	USB
Connector Type	USB
Connector type	USB
Current Rating	2.1 Amps
Customer Package Type	standard packaging
Customer Reviews	4.8 out of 5 stars 959 Reviews
Global Trade Identification Number	00734357817409
Included components	Ring Terminal Cable, USB Charger Adaptor
Input Voltage	12 Volts
Item Weight	3.84 Ounces
Main Power Connector Type	2 pin
Manufacturer	Deltran
Model Number	081-0174
Mounting Type	Wall Mount
Number of Items	1
Output Current	7.5 Amps
Output Voltage	12 Volts
Portable	Yes
Power Plug	No Plug
Power Source	Corded Electric
Special features	Fast Charging
Specification Met	CE
Total USB 2.0 Ports	1
Total Usb Ports	1
UPC	734357817409
Unit Count	1 Count
Wattage	20 watts

Battery Tender Ring Terminal Accessory Cable & USB Charger Adapter, Battery Cable & 2.1 Amp USB Charging Adapter for Mobile Devices, for Motorcycles,

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