Performance difference between jumper cable and Lithium pack

If memory serves me correctly Landyacht has an ideal setup for jump starting. A dial adjustment for voltage regulator setting. Connect the cables then tweak the voltage up to 14.8 and wait a few minutes. You would not believe the effect seven or eight-tenths volt has on amperage.

Can't use it on today's cars but my cold weather jump start system using a 6 and a 8 volt battery in series was almost magic. In the short battery series cable was a Delco relay wire and pushbutton.

Customer cranked engine, I pressed the button and suddenly his engine was fooling with 13 volts not 9 volts. Ignition engines had way more spark and my bread and butter, Mercedes diesels cranked twice as fast.

High altitude and cold temperatures brought forth diesel starting assist of the 14 volt battery plus a slug of pure 02 down the air filter inlet.

As far as the lithium battery boosters are concerned, a large majority of five star reviews is a good clue that the lithium model will work OK.

From what I've read an 85 amp hour lithium battery is quite a walletfull for use with a BiPAP.

opnspaces wrote:
That makes sense, I never considered voltage drop. I always figured the cables had to be bigger for the amount of amperage being pulled for the jump.

Not just the wires. The lithium battery itself will not have voltage sag like a lead-acid battery even when maxed out on power output.

Rangerider wrote:
My Lithium pack says if the battery being jumped is very low to leave the pack connected for a few minutes and it will charge it to a point where it can be jumped.

This is pretty much true for all of the small jump packs.

That makes sense, I never considered voltage drop. I always figured the cables had to be bigger for the amount of amperage being pulled for the jump.

Copper v/s aluminum makes a big difference

ALso Car to Car jumpers are Much. much. much longer (More feet means more resistance so you need a bigger cable)

Also read the instructions... Hook up. Pause, Pause, Pause, Start. During that Pause pause pause the jump pack transfers some charge to the larger battery.

QUALITY car to car you do not even NEED a battery in the "Target" (Dead) car. ut that grade is .. Rare.

battery jump boxes are a great invention. i have one in my truck, wife has one in her car, i always put one of the 2 in our pontoon boat when we use it. over the years i have actually used it more times jump starting total strangers with dead batteries in parking lots than on our vehicles. most people don't know they exist

Good info above. My Lithium pack says if the battery being jumped is very low to leave the pack connected for a few minutes and it will charge it to a point where it can be jumped.

I was able to start my motorhome (8.1L V8) with the battery pack only (no automotive battery). Amazing things they are.

Cable length, that's the long and the short of it. 12 volts isn't a lot of juice. It doesn't take much fall-off due to wire resistance to cause trouble. My jumpers are 20 feet long and double aught wire -- essential for cranking a diesel. My booster box, the leads are at most 12 inches. That makes much smaller wires very feasible. And they are.

One of differences would be the length of cables carrying the power. My jumper cables are 25' long and made of very heavy cable. I do have a couple of booster units and their cables are maybe 2' long if you pull hard. Shorter cables don't need to be near as thick/heavy.

Bill