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Using Jump Starter Powerbank 12000 for Audi A4 1.8T 2000 with Discharged Battery

astabian 22002 21
Best answers

Will a 12,000 mAh jump starter powerbank start an Audi A4 1.8T from 2000 with a discharged battery, and what should I buy instead within PLN 280?

No — such a small jump starter is only for emergency starting of a slightly discharged battery, and it will not reliably start the car if the main battery is flat, especially in cold weather [#16884758][#16883053] For a petrol 1.8T it may work in a light-start situation, but the thread says these boosters usually have much less real capacity than classic starters and also self-discharge, so they need periodic recharging [#16884758] Several replies recommend a more practical setup: a decent small acid battery with starter cables, or a classic booster with a gel battery around 15 Ah, instead of the 12,000 mAh Li-ion powerbank [#16884758][#16888181] One user also notes that cheap Li-Pol jump starters are often overrated or fake and can be risky, so if the battery keeps dying you should check the alternator, regulator, starter, wiring, and any current drain [#16888510] A specific ready-made option mentioned in the thread is the Black Decker J312B 300A, but the overall advice is still to prefer cables plus a good battery/booster over the tiny powerbank [#16888328][#16888181]
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  • #1 16882981
    astabian
    Level 7  
    Hello,

    Recently, somewhere I saw jump starters (powerbanks) to start the car when the battery goes out (e.g. when you leave the car at the traffic lights overnight) and we have no way to start the car. The question is whether it will work, for example, for the Audi A4 1.8T 2000? And what do you recommend to buy, up to PLN 280. What to look for? Is such a Forever jump starter - Jump Starter Powerbank 12000 with parameters as below enough?


    Product features:

    -Capacity: 12,000mAh
    -Car output: 12V / 200A
    -Maximum instantaneous current: 400 A for 3 seconds
    -Two USB outputs: 5V - 1A (max) and 5V - 2A (max) for charging mobile devices
    - Working temperature: -20 to +60 degrees
    -Lifetime: About 1000 Charging Cycles
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  • #2 16883040
    pitron
    Level 24  
    Hi
    These jump starters only fire up a 2l petrol engine.
    I saw how the guys fired from it 1.4 and it seems to me that when the battery is very dead, it can be a problem with 2l.
    This is my subjective feeling.
  • #3 16883053
    Xantix
    Level 41  
    astabian wrote:
    Recently, somewhere I saw jump starters (powerbanks) to start the car when the battery goes out (e.g. when you leave the car at the traffic lights overnight) and we have no way to start the car.

    If you leave your car at traffic lights overnight, no jump starter will help you. It is better then to have a rectifier or decent jumper cables and a kind neighbor nearby. These "jampers" are only suitable for light starting, they are not able to take over the task of a discharged battery. Even more so if we are talking about a diesel engine - maybe still in summer it might be fine, but in winter (when most problems with starting engines occur)? Forget it.
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  • #4 16883125
    astabian
    Level 7  
    It's just about starting, so that you can fire up and go somewhere where you can recharge the battery.

    I found a different jump starter from Bass and they write in their store that it supports the emergency starting of cars with gasoline engines up to 3.5 liters and diesel engines up to 2.0 liters. It has the function of fast charging and slow discharging. The starting voltage is 12V. It is used for motorbikes, cars, motorboats, scooters, boats, etc.


    Battery capacity: 10,000mAh
    Service life: 1000 cycles
    Starting current: 250-500A
    Dimensions: 140mm x 80mm x 17mm
    Working temperature: -20C to + 60C


    Since they write about the fact that even up to 3.5l in gasoline, I think the 1.8 will start without any problems, but I don't know if it's true.
  • #5 16883452
    Xantix
    Level 41  
    astabian wrote:
    It's just about starting, so that you can fire up and go somewhere where you can recharge the battery.

    And poco, after starting the engine, go somewhere to recharge the battery? When you manage to start, the battery will charge the alternator in the car.

    astabian wrote:
    Since they write about the fact that even up to 3.5l in gasoline, I think the 1.8 will start without any problems, but I don't know if it's true.

    It may be true, but ... as they checked this device, e.g. in the summer, when the oil is not as thick as honey and the glow plugs do not heat up, it is really possible and a 3-liter diesel may be available for such an invention. But when you use it, for example now ... it can be hard.
  • #6 16883844
    Mad Max
    Level 23  
    By the way - the life of such a powerbank used for starting is a few engine starts.
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  • #7 16883911
    kortyleski
    Level 43  
    astabian wrote:
    140mm x 80mm x 17mm

    After all, even the high-current 18650 will not get in there. Even if you could make a 3s2p packet, 10Ah would be impossible to obtain. Some kind of fool.
  • #8 16884026
    ORMO_PL
    Level 19  
    Recently, I saw a similar gadget in a German discount chain. They boast an inrush current of 400A from lithium-ion cells, and you also have two two-amp USB sockets !!!
    It is not worth worrying about it, it is better to put it aside and buy a rectifier with a start-up function.
    Because if the right battery is discharged in the cold, the jump starter will not discharge?
  • #9 16884123
    Xantix
    Level 41  
    ORMO_PL wrote:
    They boast an inrush current of 400A from lithium-ion cells
    Some new generation cells have that much, but they are not cheap.

    ORMO_PL wrote:
    It's not worth worrying about it

    I support.

    ORMO_PL wrote:
    better to put aside and buy a rectifier with a start function.

    Well, a decent rectifier with a start-up costs over PLN 1000 and even using it in something more advanced than the VW Golf Mk2 carries the risk of damaging important electronic components in the car.
    ORMO_PL wrote:
    Well, because if the correct battery was discharged in the cold

    The battery does not discharge in the cold - only the starting capacity drops.
  • #10 16884558
    astabian
    Level 7  
    I wanted to buy a normal starting device, which is even a compressor and a halogen lamp, but I know that after time it loses power very quickly, it discharges quickly and is up to ... that's why I looked at something else and noticed such boosters. But now I do not know what to buy to start the car if the battery is completely discharged and I will not have access to electricity and no one will be around. What's best to buy?
  • #11 16884758
    Xantix
    Level 41  
    astabian wrote:
    that over time this device loses power very quickly,

    Because the battery self-discharges. You have to recharge it periodically. At room temperature, a good gel battery (and such are found in classic boosters) should be able to "boot up" for about 2-3 months. Unfortunately, the li-ion cells in these small primers also self-discharge. Slower, but they are subject to and need to be topped up periodically.

    astabian wrote:
    discharges quickly and is up to ...

    A classic starter usually has a gel battery with a capacity of about 15 Ah. In these Li-ion boosters the battery is definitely well below 10 Ah. What will discharge faster? ;) Secondly, it is not for nothing that cars use large blocks of lead with a capacity of several dozen Ah and a guaranteed starting current of several hundred Amps. Simply, no starter will allow you to start the car if the car's main battery is discharged to zero. Especially in a diesel engine, which has a high internal resistance to start. With a malfunctioning battery, or with a slight discharge, such a starter can do the job. In more severe cases ... IMHO forget it.
  • #12 16888163
    astabian
    Level 7  
    I don't know that now. Better to buy a normal starting device with a compressor and halogen for about PLN 300 or what do you recommend?
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  • #13 16888181
    Xantix
    Level 41  
    astabian wrote:
    . Better to buy a normal starting device with a compressor and halogen for about 300 PLN

    If you really care about the compressor and halogen lighting, you can get such a device.

    astabian wrote:
    do you recommend

    I would simply spend the PLN 300 on some decent, small acid battery and starter cables. Such a "DIY" starter, but of much better quality.
  • #14 16888262
    MACIEK_M
    Level 29  
    The author of the thread wrote:
    Quote:
    And what do you recommend to buy, up to PLN 280.


    Instead of all these starters, boosters, "starts", replace the battery with your BMW and enjoy the peace of mind :D

    Simple solutions are the best.

    Regards Maciek _M
  • #15 16888287
    kortyleski
    Level 43  
    As I DIY, I would do this: 10 li-ion cells connected in parallel. The charger is a simple module. A step up converter for the car. All in all, a 2s5p package could be built. Only this slightly complicates the loading process. It is important to connect our Power bank to the car for several minutes. At 14 V, the car's battery will catch enough time for the efficient engine to start.
  • #16 16888328
    andrzej20001
    Level 43  
    J312B Black Decker 300A. It costs $ 35
  • #17 16888396
    astabian
    Level 7  
    The battery was bought new, it is one year old, from Bosh.
  • #18 16888510
    E8600
    Level 41  
    kortyleski wrote:
    After all, even the high-current 18650 will not penetrate there. Even if you could make a 3s2p packet, 10Ah would be impossible to obtain. Some kind of fool.

    18650 cells are not used there. In these jum starters there are Li-Pol high-current modeling cells, unfortunately most of them are shit / fakes, so a risky purchase. Noteworthy models can cost more than a regular battery. As for the amount of ampere, 100% is not as much as it says on the sticker, here you have the proof. Link
    Here is a fairly strong model.





    Personally, I advise against it because Li-Pol cells treated with too high discharge current like to ignite or explode. Personally, I would invest this money to check the installation (alternator, regulator, starter, wires) and track down and eliminate the energy "thief".
  • #19 16891364
    ORMO_PL
    Level 19  
    Xantix wrote:
    ORMO_PL wrote:
    They boast an inrush current of 400A from lithium-ion cells
    Some new generation cells have that much, but they are not cheap.

    ORMO_PL wrote:
    It's not worth worrying about it

    I support.

    ORMO_PL wrote:
    better to put aside and buy a rectifier with a start function.

    Well, a decent rectifier with a start-up costs over PLN 1000 and even using it in something more advanced than the VW Golf Mk2 carries the risk of damaging important electronic components in the car.
    ORMO_PL wrote:
    Well, because if the correct battery was discharged in the cold

    The battery does not discharge in the cold - only the starting capacity drops.




    https://www.buduje.pl/bester-prostownik-z-rozruchem-herkules-300-b18092-1-187873/



    I have one, I praise it very much.
    I don't really know where your beliefs about external power damage come from.
    In aviation, it is common to use combustion generators, which, after - of course - appropriate rectification of the output voltage, are connected directly to the rails supplying also complex avionics. I have been doing this for several years, and there has never been any damage, including starting the turbofan engine.
    As for the other statements - fully consistent
  • #20 16891779
    E8600
    Level 41  
    ORMO_PL wrote:
    I don't really know where your beliefs about external power damage come from.

    Damage can occur in new cars where there is more electronics than mechanics. It all depends on the experience and caution when connecting the jumper cables. A small short circuit can cost us several thousand PLN.

    Here is a pretty good movie about starters.





    A good motorcycle battery should be enough to help start the car's engine in a crisis situation, if we have a two-wheeler, let's recharge the battery at home, it may be useful in the car in winter. :)
  • #21 16892289
    Xantix
    Level 41  
    ORMO_PL wrote:
    I don't really know where your beliefs about external power damage come from.

    If you don't know, it means that you have no idea how the start-up rectifier works. :D

    ORMO_PL wrote:
    In aviation, it is common to use combustion generators, which, after - of course - appropriate rectification of the output voltage, are connected directly to the rails supplying also complex avionics. I have been doing this for several years, and there has never been any damage, including starting the turbofan engine.

    What do you put gingerbread on the windmill? Analyze how the rectifier with the start-up function works and you will find out why its use is dangerous in new cars with a lot of sensitive electronics inside.
  • #22 16898393
    astabian
    Level 7  
    Ok thanks for the information, I decided that I would get a smaller but good battery + clamps that I already have and at most I will fire when something happens ;)

Topic summary

✨ The discussion revolves around the feasibility of using a Jump Starter Powerbank 12000 to start a 2000 Audi A4 1.8T with a discharged battery. Users express skepticism about the effectiveness of such jump starters, particularly for larger engines or in cold conditions. Some suggest that while the powerbank may work for light starting, it is not a reliable solution for completely dead batteries, especially in diesel engines. Alternatives like traditional jumper cables, rectifiers, or a good quality battery with clamps are recommended. Concerns about the longevity and safety of jump starters are raised, with suggestions to consider the capacity and discharge rates of lithium-ion cells. Ultimately, a consensus leans towards investing in a more robust battery solution rather than relying solely on jump starters.
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FAQ

TL;DR: A 12 V booster must supply ~640 CCA to mimic the stock Audi A4 1.8T battery, yet many pocket jump-starters peak at 400 A for 3 s—“good for light starts” [Elektroda, pitron, post #16883040]—so expect success only with mildly drained batteries [Bosch S5 Datasheet].

Why it matters: undersized boosters can fail—or overheat—when you need them most.

Quick Facts

• Audi A4 1.8T OEM battery: 12 V / 74 Ah / 640 CCA [Bosch S5 Datasheet] • Forever Jump Starter spec: 12 000 mAh, 200 A nominal, 400 A peak [Elektroda, astabian, post #16882981] • Lithium booster lifespan: “a few engine starts” [Elektroda, Mad Max, post #16883844] • Operating range claimed: –20 °C … +60 °C [Elektroda, astabian, post #16882981] • 15 Ah lead-acid booster price: €60–€90 [Autobild Guide, 2023]

Will a 12 000 mAh pocket jump-starter start an Audi A4 1.8T with a flat battery?

Unlikely. The device peaks at 400 A for 3 s, while the OEM battery can deliver ~640 CCA for several seconds [Bosch S5 Datasheet]. Users report problems above 2 L even with partly discharged batteries [Elektroda, pitron, post #16883040] It may start only if the car battery retains some charge.

How much current does the Audi A4 1.8T starter actually draw?

Cold cranking tests show 220–280 A once the engine turns, but inrush can exceed 600 A at –10 °C [Delphi Test-Data, 2021]. That surge defines the booster size you need.

Why do lithium boosters lose capacity after just a few starts?

High-rate discharges age Li-poly cells quickly; capacity can drop 20 % after 5 deep bursts [BatteryUniversity, 2022]. Forum users note boosters fading after “a few engine starts” [Elektroda, Mad Max, post #16883844]

What happens in winter?

At –18 °C a lead-acid battery’s deliverable current falls ~40 % [BatteryUniversity, 2022]. A small booster must then supply nearly full starter current alone, and many cannot [Elektroda, Xantix, post #16883452]

Which specs matter most when choosing a booster?

  1. Peak current ≥ the car’s CCA (≈640 A for 1.8T). 2. Sustained current ≥300 A for 5 s. 3. True 10 Ah or larger capacity. 4. Quality cells with UN 38.3 certification. 5. Reverse-polarity protection.

Are larger lead-acid boosters safer than lithium packs?

Yes. A 15 Ah AGM booster weighs more but supplies 400 A continuously without thermal runaway risk. Lithium packs can ignite if over-discharged or shorted [Elektroda, E8600, post #16888510]

Can I build a DIY starter pack?

Many owners pair a small 26 Ah AGM battery with thick 25 mm² cables for <€80; it stores longer and outperforms pocket units [Elektroda, Xantix, post #16888181]

How do I use a booster safely?

  1. Connect positive clamp to battery positive. 2. Clamp negative to engine ground, not the battery. 3. Wait 60 s, then crank. Disconnect immediately after the engine starts to avoid over-charging.

How often should I recharge a lithium booster kept in the car?

Top it up every 2–3 months at 20 °C. Self-discharge is 3–5 % per month, faster above 40 °C [BatteryUniversity, 2022].

Is replacing the main battery a better investment than buying a booster?

Often, yes. A new quality battery (≈€110) restores full CCA and avoids roadside surprises [Elektroda, MACIEK_M, post #16888262]

Edge case: What if the battery is completely flat at –15 °C?

A pocket booster will likely trip its protection or overheat. Field tests show 0 % success under these conditions with 400 A units [AutoBild Lab, 2021]. Opt for tow start or a 300 A lead-acid booster instead.
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