Question 1

Will this start a completely dead battery for a gmc duramax 6.6 liter diesel?

Accepted Answer

You are not jump starting your car battery, you are jump starting your starter that starts the engine. Once the engine is running your alternator-regulator starts to recharge the dead battery. If the dead battery has internal cells that are shorted, the battery overheats and gases that leaks acid . So you should replace the battery if it does not read exactly 12 VDC when the engine is turned off. Remember you are not jump starting your car battery, you are providing 1500VA to the starter.  Hope this answers your question instead of giving just a yes or no response.  Bill is an electrical and electronics Design and RDT&E engineer with over 47 years experience in the power electronics industry and also trains electricians and electronics technicians  in servicing large UPS Battery Support systems on US Navy ships.

Question 2

What are the Watt hrs. of the internal battery ?

Accepted Answer

The voltage varies between about 13V and 16.5V, with a nominal of 14.8V.  I measured about 4Ah of capacity, by measuring the current and time to discharge and charge.  So the watt hours would be about 59Wh.

Question 3

Can it jumper start extreme discharge car battery,like a very low voltage?

Accepted Answer

Agree with others answers. I had a dead battery (zero volts) and there was no override option. I tried using this and unsuccessful. Thankfully, I had another jump starter in the car (Noco gb40) that has the override option. Car started in 2 tries. Im returning the avapow.

Question 4

Can i leave it plug in and charging  when not in use?

Accepted Answer

Yes, but best to remove for longer life expectancy once the the bar gage is solid green and not blinking. When you first receive it may take a little over an hour to recharge the device. Answered by an electrical power electronics engineer.

ASIN	B0928VN98C
Amperage	4000 Amps
Battery Capacity	27800 Milliamp Hours
Battery Type	Lithium Ion
Best Sellers Rank	#8,856 in Automotive ( See Top 100 in Automotive ) #86 in Jump Starters
Brand Name	AVAPOW
Compatible with Vehicle Type	ATV, Motor, Snowmobile
Customer Reviews	4.5 4.5 out of 5 stars (3,522)
Item Dimensions D x W x H	5.91"D x 10.08"W x 5"H
Item Weight	3.5 Pounds
Manufacturer	Dongguan Carosstech Co., Ltd.'
Manufacturer Part Number	A58
Model Number	A58
Peak Output Current	4000 Amps
UPC	704219007866
Voltage	12 Volts

Car Jump Starter, 4000A Peak Battery

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