Motor Vehicle Maintenance & Repair Asked on December 29, 2020
Twice over the past year my wife has left something on in our Honda Odyssey. Both times I’ve not been able to jump start the van using a NOCO 1000Amp 12-Volt lithium battery. But, both times I’ve been able to jump start it using jumper cables to my other car.
Cold voltage on the battery is 12.5V
Does my battery need replacement or is the NOCO just unable to jump the van’s battery?
thanks in advance!
Lithium battery boosters can be tricky. Don't know about NOCO, but I have a similar battery that has a considerable self-discharge that won't allow starting a car after 3-4 months of storage (I found out the hard way). Using the booster battery to charge a phone or something like before trying to start a car has understandably similar results.
Second, the temperature matters. All batteries (including the booster one) work way better at 20C rather than in 0C. If you are in the nortern hemisphere now, it's important.
Also, fully-depleted car battery may not accept quick charging so these 30 seconds are better made at least 30 minutes (the booster battery may or may not have enough capacity for these 30 munites).
I recommend getting a different booster. Mine is rated "160A" (1000A are unreasonable for these wires anyway) and easilly starts a 2.5 gas engine with its battery completely removed (don't try this at home!). It is also rated in ampere-hours and NOCO is not. Its manual doesn't impose 30s interval of pre-charging, it recommends to try starting immediately.
Correct answer by fraxinus on December 29, 2020
When jump starting a vehicle with another vehicle's battery, the cables, battery and alternator of the other vehicle provides a much higher current capacity (and less voltage drop) than using a portable booster device such as the lithium battery.
Note the relatively small diameter wires in the booster device compared to those of a set of jumper cables. That's the first hint that you won't get the instantaneous current/power of a set of jumper cables.
Weather Vane's reference to time is valid and I'd expect that 30 seconds is insufficient for a reasonable start. If the non-working battery is completely dead, the booster device is unlikely to start the vehicle. If the non-working battery is low and merely needs a "top-off," you'll still have to provide the luxury of time to allow the electrons to flow from the booster to the jumped-battery and settle in and get ready to work.
Cold voltage on the non-working vehicle battery is 12.5v is not surprising. If that's the voltage of the booster device, that's not going to help much. The voltage of the booster device has to be greater in order to provide the "pressure" to move those electrons to the other side.
Answered by fred_dot_u on December 29, 2020
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