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Charging Alternatives for 2x6V 10A Batteries in a Child's Toy Car: Your Experiences?

PanSamochodziq 21027 19
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Can I charge the two 6V batteries in my child’s toy car with another charger or power supply, and if so, how should I connect them?

Yes — you can charge them with the charger shown if it charges at a low current (about 0.8 A), using 6V mode when charging one battery at a time, or 12V / motorcycle mode when the two 6V batteries are connected in series with the jumper left in place [#17228275][#17228254] If the batteries are very deeply discharged, the charger may not start or may blink all LEDs; in that case, try charging one battery at a time or briefly raise the battery voltage with another 12V source, then reconnect the charger [#17228339][#17229889] The forum notes that these are gel batteries, and deep discharge can make them unusable, so if they still won’t accept a charge, replacement may be the only option [#17228295][#17229944] Two 6V batteries connected by the bridge form a 12V onboard supply, so the car can also be considered a 12V system [#17228308]
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  • #1 17228216
    PanSamochodziq
    Level 7  
    Posts: 7
    Rate: 4
    Hello everyone,
    My first post so deep bows!

    I wanted to ask for help, because in electrical matters I am a "festivity" :) .
    As in the subject, I need advice on charging batteries in a 2x6V 10A powered car. The original charger is missing, so the question is, can I charge them differently? I enclose photos of a battery compartment, charging sockets and two devices that I found at home for charging (power supply and charger). The adapter plug even fits into the socket. Maybe they can be charged with them?
    I thank you in advance on behalf of my child! :)

    Charging Alternatives for 2x6V 10A Batteries in a Child's Toy Car: Your Experiences? Charging Alternatives for 2x6V 10A Batteries in a Child's Toy Car: Your Experiences? Charging Alternatives for 2x6V 10A Batteries in a Child's Toy Car: Your Experiences? Charging Alternatives for 2x6V 10A Batteries in a Child's Toy Car: Your Experiences?
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    #2 17228235
    kierbedz4
    Level 36  
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    I recommend charging the battery with the charger below because it has several advantages, namely it can be used to charge motorcycle batteries and then charging is at a lower current and after charging the charger automatically switches to charging with a small conservation current.
  • #3 17228242
    fotomh-s
    Level 24  
    Posts: 1091
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    This charger should do the trick. Just check the instructions with what current he charges, and then check the batteries with the maximum current written.
    If the current is not too high, connect this charger to the batteries (disconnect the cables from the installation and connect to them, leave the jumper).
    You can also charge separately (without a jumper), this rectifier can be seen that it has a 6V control, which means that it can also be used in this way.

    By the way, gel batteries. If you over-discharge them, they are disposed of, or rather disposed of.
  • #4 17228249
    PanSamochodziq
    Level 7  
    Posts: 7
    Rate: 4
    I understand that I have to connect the red rectifier cable to + in one battery, the black rectifier cable to - in the other, while leaving a jumper between + and both batteries - which can be seen in the first photo?
  • #5 17228254
    fotomh-s
    Level 24  
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    Yes.
    You can also separately, then you need to set the rectifier to 6V or something. If you charge with jumper 2 at the same time, then you must have the rectifier set to 12V.

    If they do not charge, or the charger refuses to charge (it can detect that the charging current is too low) it will mean that the batteries were excessively discharged, then only replacing the batteries or playing with regeneration.
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  • #6 17228260
    PanSamochodziq
    Level 7  
    Posts: 7
    Rate: 4
    fotomh-s wrote:
    Just check the instructions with what current he charges, and then check the batteries with the maximum current written

    As in the picture.


    Charging Alternatives for 2x6V 10A Batteries in a Child's Toy Car: Your Experiences?
  • #7 17228275
    fotomh-s
    Level 24  
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    Will be OK.
    According to the instructions http://www.manualsdir.com/manuals/828461/ultimate-speed-ulg-38-b1.html?page=16 this rectifier can charge with 0.8A current, so it won't be too big. Just set the first mode (6V) as you charge individually, or the second (motorcycle) as you double charge with the jumper. Do not set modes 3 and 4 because they have higher charging currents.
  • #8 17228284
    PanSamochodziq
    Level 7  
    Posts: 7
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    I connected both 1 battery and 2 with a jumper, but unfortunately the charger blinks with all LEDs, which means:

    Charging Alternatives for 2x6V 10A Batteries in a Child's Toy Car: Your Experiences?

    I think, however, that I'm going to buy new batteries ... Maybe a little bigger right away? Must be 2 or maybe one 12V?
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  • #9 17228295
    fotomh-s
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    So they were over-discharged. To be sure, you can still check the voltage with a multimeter. If it is clearly lower than 6V (per battery) then the batteries are useless.

    You can also try to charge one at a time, there is a chance (although rather small) that one is still to be saved.
  • #10 17228301
    PanSamochodziq
    Level 7  
    Posts: 7
    Rate: 4
    And what about buying new ones, I have to buy 2 x 6V or maybe one 12V. Anyway with larger A, let him ride longer ...?
    Somewhere I saw the attention that if there is a 2-speed toy car (and this is it - slow and slow mode :) ), these are supposed to be 2 batteries, because in faster mode it pulls from both batteries. But of course this can be bullshit ... Photo of the cockpit below.

    Charging Alternatives for 2x6V 10A Batteries in a Child's Toy Car: Your Experiences?
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    #11 17228308
    fotomh-s
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    There can be one 12V. The car always pulls from both because the batteries have a common jumper and there is no separate cable for each battery. As a result, two 6V batteries connected in series with a jumper give 12V.
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  • #12 17228319
    PanSamochodziq
    Level 7  
    Posts: 7
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    Thank you for your help! So something like the following can I safely disconnect from the alarm and check? :P

    Charging Alternatives for 2x6V 10A Batteries in a Child's Toy Car: Your Experiences?
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    #13 17228320
    fotomh-s
    Level 24  
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    You can check.
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    #14 17228339
    kierbedz4
    Level 36  
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    Yes, you can safely connect. If the batteries are discharged too deep, this rectifier will not charge, because the electronics of this rectifier is powered from the batteries to which the rectifier is connected, then for a short time connect the other 12V rectifier to the batteries to increase the voltage on the batteries, and then connect this rectifier from the photo below.
  • #15 17228342
    PanSamochodziq
    Level 7  
    Posts: 7
    Rate: 4
    It's ok - the car went !!!! Thank you. I have no idea about the power supply.

    Now there is the problem of controlling the RC with this toy car. Unfortunately, the radio that was next to the car is not from him. Do you know how to check which radio is right for you?
    Maybe you can choose something from other RC toys, and if not, at least buy the correct one.

    Added after 7 [minutes]:

    kierbedz4 wrote:
    Yes, you can safely connect. If the batteries are discharged too deep, this rectifier will not charge, because the electronics of this rectifier is powered from the batteries to which the rectifier is connected, then for a short time connect the other 12V rectifier to the batteries to increase the voltage on the batteries, and then connect this rectifier from the photo below.


    And if we connect 2 discharged 6v battery to this 12V (in series) and start charging .... I am a little fanciful, but will this rectifier with electronics not detect it? Because the power supply was 2x6v all night and nothing ...
  • #16 17229332
    Anonymous
    Anonymous  
  • #17 17229428
    fotomh-s
    Level 24  
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    BC109B wrote:
    PanSamochodziq wrote:
    And what about buying new ones, I have to buy 2 x 6V or maybe one 12V. Anyway with larger A, let him ride longer ...?
    Somewhere I saw the attention that if there is a 2-speed toy car (and this is it - slow and slow mode :) ), these are supposed to be 2 batteries, because in faster mode it pulls from both batteries. But of course this can be bullshit ... Photo of the cockpit below.

    Charging Alternatives for 2x6V 10A Batteries in a Child's Toy Car: Your Experiences?

    A long time ago I came across such a car - in the first gear the power supply was 6V, in the second gear the batteries were connected in series and the power supply to the engines was 12V.


    But how can a 6V power supply be in first gear when there is a simple jumper on batteries? There are no separate cables from the batteries, but there is an ordinary jumper which with 2 batteries 6V makes practically one 12V ... The jumper constantly connects both batteries as seen in the pictures ...
    So how can a 6V power supply in first gear be used? The jumper will magically disappear? ;-)
  • #18 17229889
    kierbedz4
    Level 36  
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    Two 6V batteries connected by a bridge constitute a 12V on-board installation. If you deeply discharge the batteries while driving, the electronic rectifier may not start charging, then connect the second 12V power supply for a short period to increase the voltage on the above batteries, then connect the electronic rectifier and it will charge this battery set and after charging it automatically disconnects charging and switches to conservation charging with low current. Single charged batteries charged with 6V voltage and setting the charger to 6V range may also not start charging due to the fact that both batteries are deeply discharged.
  • #19 17229944
    fotomh-s
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    If they were deeply discharged, you won't even charge them with a laboratory power supply.
    There are methods to bring them back to work. Some resuscitated gel batteries by adding distilled water. However, if it is sulphated, this method may not work.

    The problem with gel batteries is that when you deeply discharge them, you have a problem. They are maintenance free as long as you make sure that they do not overcharge.

    Once I wanted to bring back one such 12V battery, unfortunately no adding water or combining with voltage / current did not help. Generally, gel battery after deep discharge is useless.
  • #20 17230341
    Anonymous
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Topic summary

✨ The discussion revolves around alternative charging methods for 2x6V 10A batteries in a child's toy car after the original charger was lost. Users suggest using a rectifier that can charge motorcycle batteries, emphasizing the importance of checking the charging current to avoid overloading the batteries. It is recommended to connect the batteries in series with a jumper for charging, ensuring the rectifier is set to the appropriate voltage (6V for individual charging or 12V for simultaneous charging). Concerns about over-discharging gel batteries are raised, with suggestions to check voltage levels and consider replacing the batteries if they are deeply discharged. The possibility of using a single 12V battery instead of two 6V batteries is also discussed, as the car operates on a 12V system when the batteries are connected in series.
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FAQ

TL;DR: Missing charger? Use a smart 12V unit; its 0.8 A mode is safe—“Will be OK.” Charge via the series jumper (12V) or each 6V separately using the correct mode. Avoid high‑current modes. For parents fixing 2×6V ride‑on cars when the original charger is missing. [Elektroda, fotomh-s, post #17228275]

Why it matters: This helps you safely charge and diagnose 2×6V gel batteries without damaging the pack or toy car.

Quick Facts

How do I charge two 6V batteries in a toy car without the original charger?

Use a smart charger and connect across the series pack. Clip red to the + of one 6V battery and black to the − of the other. Leave the jumper linking the middle terminals; it forms a 12V pack. Set the charger to 12V for this configuration. To charge each battery individually, set the charger to 6V and do them one at a time. If the charger refuses to start, the batteries may be too discharged. [Elektroda, fotomh-s, post #17228254]

Which charger settings work best (modes, current)?

On an Ultimate Speed ULG 3.8 B1, use Mode 1 (6V) for a single 6V battery. Use Mode 2 “motorcycle” for the two batteries in series as a 12V pack. The unit can charge at about 0.8 A, suitable for small gel cells. Avoid Modes 3 and 4 due to higher current. As one expert noted, “Will be OK.” [Elektroda, fotomh-s, post #17228275]

Can I charge the two 6V batteries separately?

Yes. Charge each 6V battery individually with the charger set to 6V. When charging both together via the jumper, set the charger to 12V. If the charger refuses to begin, it may be detecting too low a voltage, which indicates deep discharge. Precharge briefly, then try again. [Elektroda, fotomh-s, post #17228254]

My charger flashes all LEDs and won’t start. What does that mean?

Smart chargers need minimal pack voltage to power their electronics. Deeply discharged batteries fall below that threshold, so the charger blinks and aborts. Briefly lift the pack voltage with another 12V supply or charger, then reconnect the smart charger to begin normal charging and float maintenance. [Elektroda, kierbedz4, post #17228339]

What’s the correct way to connect the clamps on a two‑battery series pack?

Connect red to the positive terminal of one 6V battery and black to the negative terminal of the other 6V battery. Keep the jumper linking the remaining two terminals; it makes a 12V pack. Use 12V charger mode when charging across the series pack. [Elektroda, fotomh-s, post #17228254]

Can I replace 2×6V with one 12V battery?

Yes. A fixed jumper across two 6V batteries already creates a 12V source. You can install one suitable 12V battery instead, ensuring fit and connectors match. Vehicle performance remains 12V‑based with either configuration. [Elektroda, fotomh-s, post #17228308]

Does a two‑speed ride‑on car need two batteries?

It depends on wiring. Some models route batteries through the speed selector to switch between 6V and 12V. Others use a fixed jumper, so the vehicle always runs at 12V. Inspect your harness to confirm which layout you own. [Elektroda, Anonymous, post #17230341]

Will a higher Ah battery make the car run longer?

Yes. Amp‑hours indicate stored charge. At the same load, a higher Ah battery increases runtime roughly proportionally. Confirm the larger battery fits the compartment and remains compatible with your charger’s settings before purchase. [Battery University, 2023]

Can I test the car using a 12V alarm battery?

Yes. You can safely connect a known‑good 12V alarm battery to verify the drivetrain and wiring. This quick test helps confirm a battery issue before buying replacements. [Elektroda, fotomh-s, post #17228320]

How do I tell if a 6V battery is too far gone?

Measure open‑circuit voltage with a multimeter. If it reads clearly below 6.0 V per 6V battery, it is likely unsalvageable. Deep discharge damages gel cells quickly. Try individual charging only if the reading is near 6V. [Elektroda, fotomh-s, post #17228295]

Can a lab power supply revive a deeply discharged gel battery?

Usually no. When gel batteries are deeply discharged, even a laboratory supply may not charge them. Some attempt adding distilled water or voltage tricks, but sulphation often prevents recovery. “Generally, gel battery after deep discharge is useless.” [Elektroda, fotomh-s, post #17229944]

How do I kick‑start a dead pack so the smart charger will engage?

Follow this precharge routine:
  1. Disconnect the pack from the toy’s wiring.
  2. Briefly connect another 12V supply or charger to raise pack voltage.
  3. Reconnect your smart charger; it will charge, then switch to maintenance automatically. This overcomes low‑voltage lockout in many smart chargers. [Elektroda, kierbedz4, post #17229889]
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