is there a usb port attachment for ipad for battery life

If there's a cigarette lighter in your car, use this ->

• USB-A -> https://www.apple.com/shop/product/HN812ZM/A/mophie-dual-usb-a-car-charger?fnode=9c5e999b83057cfb8e7fb1d4fbc4ec0bcd0f034f02af819ee10abb080b8dc12afaa84ce11c9f26e063b447e4205573bbfb119f6b707a09963133cf7c1b7f57a4bd108946f68930d280291e683847343f3ce2a54590c606a5f5609e759722efbe2cf94d5a576ab4fa35ef9a12740908bb
• USB-C, If you have iPad Pro 11 inch or iPad Pro 12.9 inch 3rd generation or later -> https://www.apple.com/shop/product/HN7Z2ZM/A/mophie-usb-c-car-charger?fnode=9c5e999b83057cfb8e7fb1d4fbc4ec0bcd0f034f02af819ee10abb080b8dc12afaa84ce11c9f26e063b447e4205573bbfb119f6b707a09963133cf7c1b7f57a4bd108946f68930d280291e683847343f3ce2a54590c606a5f5609e759722efbe2cf94d5a576ab4fa35ef9a12740908bb

The USB port in your car may not be able to provide adequate current for the Pad - many being limited to between 0.5A - 1A at 5V (i.e., 2.5W to 5W). For most models of iPad 10-12W are required to successfully charge an iPad.

If you car has a 12V socket outlet, suitable higher-power USB Charging adapters are easily available from many motor factors and online stores.. Anker and other good brands can be found on Amazon.

No. This will be an adapter that fits into the 12V socket in your car; the Adapter will have a USB outlet, to which you connect your standard Lightning charging cable - and in turn, your iPad.

Here are some examples - there are others:

https://www.anker.com/products/108/204/car-chargers

Are you using the USB ports just for charging the iPad in your car? If you can't use the 12V adapter options suggested above, there is nothing you can do to increase the output from the car USB port. Instead, you might want to invest in portable power bank to keep the iPad charged while being used in motion.

See something like this --> https://www.amazon.com/Belkin-Lightning-Connector-MFi-Certified-Portable/dp/B07FK9M6N8/ref=sr_1_4?dchild=1&keywords=power+bank+lightning+charge&qid=1594249852&sr=8-4

As I have already indicated, the fitted USB ports in your car cannot provide adequate power to charge an iPad.

Instead, you must use the 12V socket(s) in your car with a Charging Adapter that can provide the necessary power to an iPad. As an alternative, if you cannot use any 12V sockets In your car, is to use a USB PowerBank (this being a big battery to charge/run the iPad(s).