No. it is possible for welders to back-feed voltage into the system and can damage computer modules on the vehicle. Two fully charged healthy batteries on average will get you about 3ft of weld and still be able to restart both vehicles.

The welder has a Voltage gauge to help keep and eye on the battery status while welding. Two fully charged batteries should be about 26v, if you need more welding time, you will want to stop welding when you get close to 24v. Disconnect the welder, reconnect to vehicles and recharge the batteries with the alternator.

Regular flooded Lead Acid, or Gel Cell Batteries are recommended. Lithium Batteries are not recommended due to their known instability during rapid discharge. Using Lithium batteries may contribute to unnecessary fire risk

The Welding Gun is on a 6ft lead, the other leads off the welder are about 5ft, and the jumper cables are 16ft.

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What Tips do I need to use?

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The welders come with a Harbor Freight tips and they are great as replacements.