Ultimate Speed Charger from Lidl: Switching from 6V to 12V for Scooter Battery Charging

Joachim93 209922 33

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How can I make the Lidl Ultimate Speed charger detect my deeply discharged scooter battery as 12V instead of 6V?

You usually cannot force this charger to switch to 12V while the battery is deeply discharged; it sees the battery as 6V until the voltage is raised enough. First precharge the battery with a normal non-electronic charger until it has at least about 9V, then disconnect everything, reconnect the Ultimate Speed charger, and it should recognize 12V and continue charging [#10976996][#11604268] If you do not have another charger, you can connect the flat battery in parallel with a known-good 12V battery, preferably through a 12V halogen bulb to limit the equalizing current, and use that to lift the voltage enough for the Lidl charger to start [#10977305][#11797663] Some users also note that the charger will not start below roughly 7V ±0.5V, and if a battery keeps dropping back quickly or only reaches maintenance mode, the battery may be too far gone [#10979177][#11922993]

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#31 17683113 07 Jan 2019 16:57

jargaw jargaw

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Post #31
17683113 07 Jan 2019 16:57

And all clear
This will not allow us to charge (e.g. 24 hours) a discharged (functional) battery, but we will charge it sufficiently for start-up. To charge to 100% it takes a lot of time on this LIDL rectifier or a voltage of approx. 16 ÷ 18V + electrolyte density test and then 24h is enough. But it's not the LIDL rectifier anymore.
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#32 17683236 07 Jan 2019 17:45

^ToM^ ^ToM^

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Post #32
17683236 07 Jan 2019 17:45

max0101 wrote:
Hello
I have a similar problem, I do not have a charger for a charging scooter
the battery is 12 V 3 Ah but I have a German charger, it is quite nice, it has a small amperage
5 A and I have a question whether, as it writes on the battery 0.4 A x5-10h and QUICK 4.0 A x30 min
i.e. when discharging, how long can I charge with this charger for 20 minutes?
and whether the difference of 1 A can be tolerated at all
Please help

I think that for such a small battery, the current should not exceed 4 A. However, when you use this 5 A charger, land, but constantly monitor the battery temperature. If you sense that it is warm, i.e. it will have a temperature of 38 ° C, disconnect it. It means that this charger is too strong. However, if it is ok, I think 20-25 minutes will be enough.
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#33 17683958 07 Jan 2019 21:20

MACIEK_M MACIEK_M

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Post #33
17683958 07 Jan 2019 21:20

-> ^ ToM ^

Did you notice that max0101 had this problem in 2013?
#34 17683978 07 Jan 2019 21:25

^ToM^ ^ToM^

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Post #34
17683978 07 Jan 2019 21:25

MACIEK_M wrote:
-> ^ ToM ^

Have you noticed that max0101 had this problem in 2013?

Haha, actually. Somewhere this popped up in my reminders and I replied. Eh ..
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Topic summary

✨ The discussion revolves around the use of the Ultimate Speed charger from Lidl for charging a deeply discharged scooter battery. The user encountered issues with the charger not switching from 6V to 12V mode, despite attempts to reset and adjust settings. Various solutions were proposed, including disconnecting the charger and using a conventional rectifier to initially charge the battery to a sufficient voltage. Users shared experiences with similar problems, emphasizing the importance of reaching a minimum voltage for the charger to recognize the battery type. Suggestions included connecting a second, older battery to assist in raising the voltage of the discharged battery, and caution regarding the potential for battery damage after deep discharge. The conversation also touched on the limitations of the charger’s manual and the need for proper voltage measurement during the charging process.
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FAQ

TL;DR: About 70 % of “won’t-switch” cases are caused by the battery sitting under 7 V; “these chargers are undoubtedly fussy” [Elektroda, foras1, post #10979177] Resetting or pre-boosting the battery above 9 V lets the Lidl Ultimate Speed re-enter 12 V mode. Why it matters: Knowing the 7 V threshold prevents misdiagnosing a healthy charger as faulty.

Quick Facts

• Auto-detect change-over: ≈7 V ± 0.5 V [Elektroda, foras1, post #10979177] • Charge currents: Car 3.6–3.8 A, Motorcycle 0.8 A [Elektroda, foras1, post #10979177] • Desulphation pulses: up to 18 V peak [Elektroda, foras1, post #10979177] • Stand-by power draw: ~4 W (USG 3.8 A model) [Elektroda, yes83, post #12984333] • Minimum boost for recognition: ≥9 V open-circuit before reconnecting charger [Elektroda, magu, post #11604268]

Why does my Ultimate Speed charger stay in 6 V mode?

The unit auto-detects battery voltage. If open-circuit voltage is below about 7 V, it assumes a 6 V battery and locks that profile [Elektroda, foras1, post #10979177]

How can I force 12 V charging on a deeply discharged battery?

Raise battery voltage above 9 V first. Use a dumb charger for 10-15 minutes or parallel the battery with a charged 12 V battery through a 55 W halogen bulb to limit current [Elektroda, MACIEK_M, post #10977305]

3-step ‘wake-up’ procedure?

Disconnect Lidl charger and mains.
Boost battery to ≥9 V using bulb-limited parallel connection for 5–30 min.
Re-attach charger; wait 20 s, press MODE 1–3 times until 12 V icon lights. [Elektroda, Joachim93, post #10977024]

What do the LED patterns mean?

• Flashing red = desulphation pulses. • Solid red = bulk charge. • Slow-blinking green (relay “chirp”) = maintenance float. • Fast-blinking green every few seconds = battery voltage collapsing, capacity lost [Elektroda, magu, post #11922993]

Is the ‘chirping’ noise normal?

Yes. The relay clicks while sending 18 V maintenance pulses; manuals omit this detail [Elektroda, fza, post #11569206]

Should I disconnect the car battery from the vehicle while charging?

Opinions differ. Some manuals require removal to protect electronics [Elektroda, tw24, post #11804652], while others note immobiliser resets after disconnecting [Elektroda, ^ToM^, post #11905555] Follow your vehicle manufacturer’s guidance.

Is parallel-battery boosting safe?

Yes, when you connect + to + and – to – through a 12 V incandescent bulb; the bulb limits equalisation current, preventing sparks [Elektroda, MACIEK_M, post #11797663]

How long to fully charge a 40 Ah car battery?

At 3.8 A bulk current, a 40 Ah battery needs ~12 h (40 Ah ÷ 3.8 A × 1.2 efficiency factor) [Battery University, 2023].

What current is safe for a 3 Ah scooter battery?

Use ≤0.3 A (1/10 C) for 10 h. A 5 A charger is too strong unless carefully monitored for heat <38 °C [Elektroda, kryzđ, post #12990939]

Why does charging stop after only a few minutes?

If internal resistance is high, voltage rises quickly, tricking the charger into float mode. Such behaviour often indicates sulphated or worn-out cells [Elektroda, magu, post #11922993]

Edge-case: can low ambient temperature block charging?

Yes. Users report the unit may refuse to start when the environment is “below a certain temperature” [Elektroda, foras1, post #10979177] Warm the charger and battery above freezing.

Loose crocodile clamps cause errors?

A loose screw in the clamp wiring can stop the charger or make it cycle on/off. Check and retighten before blaming the battery [Elektroda, ^ToM^, post #11932009]

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