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Author Topic:   Micro-Start XP-3 Reserve Power Source
Tom W Clark posted 02-18-2014 11:21 AM ET (US)   Profile for Tom W Clark   Send Email to Tom W Clark  
This back up power source seems awfully small to start a truck with a dead battery. Would it start an outboard motor?

jimh posted 02-18-2014 11:06 PM ET (US)     Profile for jimh  Send Email to jimh     
The "Specs" say it can produce 400-Amperes of peak current. That ought to help crank an outboard engine, but it better start quickly. I don't think it will put out that current for very long.
Chuck Tribolet posted 02-19-2014 04:35 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
And those thin wires on the jump start "cables" will get hot
in a hurry at starting currents.


ECTR posted 02-20-2014 10:55 AM ET (US)     Profile for ECTR  Send Email to ECTR     
Have owned one since December and have given it a workout this winter. It almost defies the laws of physics.

Works well if there is some charge left in the jumped vehicle (starter clicking). I have not used it on a fully discharged vehicle, but did have an opportunity to use it three consecutive times on one charge. The cables do get warm but it keeps your hands warm when it’s 3 below.

It will make a nice light weight backup to keep on the boat.


jimh posted 02-20-2014 11:57 AM ET (US)     Profile for jimh  Send Email to jimh     
My speculation on the principle of operation:

--the highest current demand for engine cranking is at the initial moment the electric motor is trying to move the engine

--once the electric motor starts to spin, the current drops off

--the small battery pack provides the voltage and current boost at the instant it is most needed, just as the electric motor is trying to overcome the stalled condition

--once the starter motor begins to spin the engine, the main cranking battery can supply more voltage and current than it could during the stalled condition, so it can maintain the engine cranking

Thus the small booster battery only has to work for a very short time in the cranking process. If the main battery were removed, the little battery probably could not delivery enough voltage and current on its own to sustain cranking.

Ridge Runner posted 02-20-2014 09:04 PM ET (US)     Profile for Ridge Runner  Send Email to Ridge Runner     
Video of the Micro-Start:

The product has also gotten good reviews on amazon.

They make some very compact light weight high cranking amp batteries (though expensive and low amp hours):

Model YTX12-24
- Lithium Nano-Phosphate Battery
- 720 Cranking Amps
- 25Ah
- 5-7/8" Length x 3-7/16" Depth x 5-1/8" height
- Weight 5 lbs

Price $429.99

Chuck Tribolet posted 02-20-2014 11:33 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Also, if the battery has a very low internal resistance, it
can maintain a higher cranking voltage than a lead-acid

If I recall correctly, a lead-acid battery can drop to about
6-8V while cranking.


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