if you need a boost or charge, connect directly to the battery. what if you start the car with a dead battery and it pulls power thru the cigarette lighter wiring. and while in theory you should be able to charge thru the cigarette lighter what happens if all your fail safe protections fail. there is a reason the battery is close to the alternator, to shorten the run. One last thing, electricity voltage drops the longer the run and the smaller the wire. Relying on technology is only cool if you are near the tech guy for backup, if you travel off grid, keep it simple, keep systems isolated I keep everything RV separate from the vehicle. a dual battery switch works and never fails if you remember to use it. dual batteries and battery isolators are great til they fail. and when not running, disconnect ALL the draws. a good battery is best, they usually last less than 10 years, get your tested. booster cables to a running vehicle better. I carry jumper cables and I also carry a small oddysey 16ah agm, that I can use to jumpstart my van or if the battery is completely dead I can just use the oddesey as a start battery it has the side/top posts, the oddysey is a beast of a battery for its size. Thats one reason I don't even carry a jump pack anymore. There have been times when my start battery was completely dead and it wouldnt jumpstart and have also encounter situations where I tried to jumpstart someone with jumper cables and there car wouldn't start because the battery was completely dead. This boost/buck converter will turn 12 volts into 14.4 volts at 6 amps, and will give your lead acid a quick boost. No need to buy a jumpstarter unless you need the engine to start right away. Keep your battery in top condition even when your vehicle is in storage with chargers & maintainers from Harbor Freight. On my van I use a boost/buck converter to top off my start battery from the house battery every day. But to improve your chances you can always build a boost/buck converter to turn the 12.6 volts from the bluetti into 14.4 volts to give the start battery a quicker boost. In an emergency, I think your bluetti can put enough amps into your battery to start it, but it might take 1/2 an hour. The agm jumpstart put just enough amps to give me one crank. I decided to crank the van over one last time, and it crank slowly but it started. I had one of those 18ah agm jump starter but it was also dead at around 12 volts, it wouldnt crank over the van, but I left it connected for about 1/2 hour while I decided what I was going to do. If, on the other hand, you try to power three coolers, each pulling 7.5A, you're going to blow your fuse.One time I had a dead battery on my astrovan, it wouldn't crank over. In total, you're drawing (1A + 0.5A + 7.5A) 9A of current, so you're good. In the last plug, you connect an electric cooler which draws about 7.5A. You connect a GPS to the second plug and it draws probably half an amp. If you have a recent phone, it probably draws about 2A at 5V (your adapter reduces the voltage from 12V to 5V) which is just under 1A at 12 volts. You connect your cell phone charger to one plug. You plug in your extension and plug three accessories into the plug. Let's say the lighter jack in your dash is protected by a 15A (amp) fuse. How much current each accessory draws, however will be added together, and can't exceed the current capacity, usually dictated by the fuse. Portable cigarette lighter receptacles attached to cables and alligator clips for connection directly to car batteries are available for temporary use. When you purchase a lighter plug extension that adds three extra plugs, you're not changing the voltage because the plugs are in parallel with each other so that each plug can deliver 12V to the accessory connected.
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