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Using a jump pack overnight - consequences? #5320504 01/12/20 07:58 AM
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henni Offline OP
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Is there anything to be aware of leaving a jump pack connected to a car battery overnight ?

Clearly, the intended purpose of any modern jump pack is to briefly connect it, start the car and disconnect.

What negative issue may result to the car battery if left connected for 24 hours?

For the sake of analysis, let's assume the car battery is fine but car is driven only 1 or 2 days a week and then only for very short duration (20 minutes). Clearly, not enough time to fully compensate for a slow discharge due to on-board electronics. In case it matters, the car has an AGM battery and the jump pack has a Lithium battery. Let's also assume that no practical way exists to use an electrical connection/trickle charger (ie. airport parking, condo parking)

The jump pack (source) would slowly equalize voltages to the car (destination) battery.

I would expect that the jump pack would be Ok to recharge under this scenario but would something unforeseen occur to the car battery if this was done repeatedly?

Re: Using a jump pack overnight - consequences? [Re: henni] #5320511 01/12/20 08:08 AM
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SubLGT Offline
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As long as thé Li-ion jump starter has over-discharge protection, I don't see a problem. Li-ion batteries are not tolerant of over discharge.

Re: Using a jump pack overnight - consequences? [Re: henni] #5320520 01/12/20 08:16 AM
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andyd Offline
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Wabbout a solar powered float charger? Something designed to do what you want.


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Re: Using a jump pack overnight - consequences? [Re: henni] #5320533 01/12/20 08:30 AM
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DrDanger Offline
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Lithiums are also not damaged in any way from being at a low charge -10 % or so (unlike lead acid batteries).
You dont need to keep them topped up. Each charge/discharge cycle does take away from their 1000-2000 cycle life.

Last edited by DrDanger; 01/12/20 08:36 AM.
Re: Using a jump pack overnight - consequences? [Re: henni] #5320535 01/12/20 08:30 AM
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henni Offline OP
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Solar is not available at the destination.

Question is not to "fix this issue" - the question is about "negative consequences" ?

Re: Using a jump pack overnight - consequences? [Re: henni] #5320540 01/12/20 08:33 AM
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Snagglefoot Offline
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I see what you’re asking. It would be cool is they had a low amp slow charge mode, but these jump packs are designed for high amps. I would think they would quickly peter out as there are only so many amp hours available in the lithium ion batteries. Damage; I doubt it.


If you want the job done right......do it yourself.
Re: Using a jump pack overnight - consequences? [Re: henni] #5320544 01/12/20 08:36 AM
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Negative to either battery? None.

The only negativity I have is that it's a pretty dirty hack, which, if successful, will encourage the operator to do other dirty hacks. But that's none of my business.

The ideal would be to give the battery a 14.5 volt source that actually charges it. Mixing 12.7 with 12.5 volts isn't going to do much to the lesser battery.

PS my F150 only goes to the dump once a week, and runs for maybe 15 minutes. I throw a charger on it every 6 months or so to desulfate it and/but the battery acts 80-plus percent full.

Re: Using a jump pack overnight - consequences? [Re: henni] #5320556 01/12/20 08:51 AM
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Audios Offline
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Usually the lithium packs are not supposed to be connected for more thank 30 seconds. Read the owners manual.


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Re: Using a jump pack overnight - consequences? [Re: henni] #5320616 01/12/20 09:53 AM
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bullwinkle Online Confused
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I'm going to be the one to ask the stupid question-why? If you left the fully charged jump box in the car, but not connected, you could charge it on the day or two you use the car, and then it would be ready when you needed it. I kind of use my Clore JNC-660 this way-it stays in the (warm) house to be fully ready if needed for a winter jump, and I charge it off the car/truck lighter plug if I'm going somewhere to use it it to power the trailer winch and/or jump something. This concept has worked well for the 3+ years I've had it.


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Re: Using a jump pack overnight - consequences? [Re: henni] #5320617 01/12/20 09:54 AM
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kc8adu Offline
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it will put shallow cycles on your jump pack while providing no benefit.
big waste of time.
invest in a small solar panel.
you have to get the voltage up to fully charge.
my agm charger holds at 14.7v till the current drops to under 500ma.
a 5w unregulated will do this.
or get close.
you have enough parasitic loads in a modern vehicle that overcharge with a 5w panel is not possible.
use an isolation diode and a fuse of course.

Re: Using a jump pack overnight - consequences? [Re: henni] #5320629 01/12/20 10:20 AM
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henni Offline OP
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Solar is not available at the location, literally underground

Re: Using a jump pack overnight - consequences? [Re: henni] #5320655 01/12/20 10:55 AM
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Snagglefoot Offline
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The old style jump packs ( not lithium) are fine at what you are describing. I use them for that when the kids are blasting the stereo on the boat.


If you want the job done right......do it yourself.
Re: Using a jump pack overnight - consequences? [Re: bullwinkle] #5320712 01/12/20 12:29 PM
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javacontour Online Content
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This is what I was thinking.

The potential negative consequence is you end up with a flat battery and a non-working jump pack, the worst of both worlds.

Keep the jump pack separate and charged.

Since the battery is AGM, even in a condo, you could remove it from the vehicle bring it in the condo and charge it there. Doesn't work for the airport, but does work for when left at home for long stretches.

Instead of connecting the jump pack, why not disconnect the battery to eliminate the parasitic drains going on.

Sure, you'll have to actually use a key to open the door when you return to the vehicle as your keyless entry will not work. But the state of the battery should pretty much be the same as when you left it.

Originally Posted by bullwinkle
I'm going to be the one to ask the stupid question-why? If you left the fully charged jump box in the car, but not connected, you could charge it on the day or two you use the car, and then it would be ready when you needed it. I kind of use my Clore JNC-660 this way-it stays in the (warm) house to be fully ready if needed for a winter jump, and I charge it off the car/truck lighter plug if I'm going somewhere to use it it to power the trailer winch and/or jump something. This concept has worked well for the 3+ years I've had it.


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Re: Using a jump pack overnight - consequences? [Re: javacontour] #5320754 01/12/20 01:23 PM
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Originally Posted by javacontour

The potential negative consequence is you end up with a flat battery and a non-working jump pack, the worst of both worlds.
Keep the jump pack separate and charged.


Exactly. You won't be disappointed doing this.


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Re: Using a jump pack overnight - consequences? [Re: DrDanger] #5320785 01/12/20 02:05 PM
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Originally Posted by DrDanger
Lithiums are also not damaged in any way from being at a low charge -10 % or so (unlike lead acid batteries).
You dont need to keep them topped up. Each charge/discharge cycle does take away from their 1000-2000 cycle life.


Hi,
that's not true, is it?
Only protected Lithium cells are protected. Lead Acid would be likewise protected if protection was provided. Comparing protected calls vs unprotected cells is no measure of life.
Cheers,
Iain.
PS. No I would not leave A Lithium battery pack connected to a Lead acid battery. I would leave a lead-acid battery connected to a lead-acid battery overnight or longer.

Last edited by SpitFire6; 01/12/20 02:12 PM. Reason: ps

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