Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: Is it less likely to drain the car battery if it's plugged into a vehicle 120V AC plug when the engine is off?
Document: to keep it cool when the unit is off for 1/2-1 hour when at lunch or supper since I do not dare let it run off the car battery when the engine is not running. On my vehicle, the DC plugs are dead anyway when the engine is off and the key is removed., but on a hot, sunny day, the inside of the car could get up into the 90's so that is why I put 2 frozen plastic Blue Ice packs in each cooler.
It runs down the battery on the boat or the car if the motor isn't running. I wish it wasn't such a drain. Otherwise, it is great on long trips in the car. Keeps food and drinks cold without the mess of ice.
This study was done over an hour and a half and had the fridge totally empty. It is using the AC adapter, which might alter the cooling, but I wasn't willing to risk draining my car battery to test this with the car plugin. The baseline had both the thermometor as well as the fridge at 66F.
I purchased this from W-Mart for use when car-camping. No matter the powersource (various ciglights in vehicle) or outlet/plug combinations, it would constantly turn off. And it overheated on occasion - simply touching the area where the fan was located was hot to the touch, despite having plenty of ventilation (ie, outside in shade). I felt uncomfortable leaving it running unattended. It completely died during that 1st trip, ruining over $100 worth of food. I returned it to WMart.
Stop wasting money on Ice, just plug it in the vehicle and go. This has made it more enjoyable to go on those long drives with the family. No stopping for Ice, and draining the cooler.
Had this for a week and had the plug break while pulling it out of socket. Now this wasn't because of an abuse in pulling it out, it was the end of the plug itself that broke off. Knowing about electric wiring I was able to buy at pep boys a new plug a little lower rated but will do till I can find a site to get the exact plug from. Otherwise it works fine but needs to be plugged in constantly to maintain cooling.
While I've had this product before I was very disapponted that this one did no come with the AC/DC plug as my first one did. The description should have indicated it did not come with the power plug. I guess I'll have to search the internet and hope to find a plug that will work. This can always be a challenge to get the right one and you never know until after you've spent the money. I guess it's one way to make more money off the consumer.
One of my friends bought one 2 years ago for long road trips and also loves it. I recently saw it at Walmart for $92 but I do not know if that includes the DC to AC adapter.SAFETY WARNING:  This unit draws 4 amps. If you have two coolers, NEVER plug both units into one DC outlet using a one outlet to two or three outlet adapter.
My hunting buddy has an older model, so I had to buy one for the extra storage for a long hunting trip to Montana (we are from Minnesota). The cooler worked great, was quiet, and the adapter for AC power was very handy for overnight in  the hotel room. We left one cooler plugged in all the time at the hotel, used the small refrigerator in the room, and used the other cooler in the truck for our portable fridge in the field.
The cooler fan assumbly needs to be cleaned of dust every 6 months or when ever it starts to gather dust. If not the cooler won't work as well. If you unplug this cooler you have about 2 hours on a hot day before your food gets warm again. If you are using this cooler in a car or an SUV do not leave it plugged in overnight! You will have dead batteries in the morning.
Answer: yes