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Sena z Biedronka Automatic Rectifier: Min Current for 12V 6-10Ah Motorcycle Batteries (Max 2/4A)

Grzesio70 10863 13
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  • #1 17333561
    Grzesio70
    Level 12  
    Hello!
    Has anyone of your colleagues measured and know the minimum current at 12v in this rectifier. The manufacturer in the leaflet gives only information about the maximum current (V max = 2 / 4A 12V). I am asking because I want to use this charger to charge 6 and 10Ah motorcycle batteries. The rule is that the current value up to 1/10 of the battery capacity. Or maybe something has changed and lives in ignorance.

    Regards!
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  • #2 17333600
    Jawi_P
    Level 36  
    You can easily charge the battery both. The battery will be fully discharged as it will take more current only for a while and will fall later.
    Your motorcycle charges the battery exactly the same.
  • #3 17333672
    Grzesio70
    Level 12  
    Thanks with the quick reply. The thing is that currently in Biedronka this charger is in the promotion and I can buy it. I can also borrow another one with the symbol BC-something there, which has clearly written on the box that it charges with electricity min. 0.8A 12V. Hence my question about the minimum of "Biedronkowa". Maybe someone knows or measured.
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  • #4 17333941
    Jawi_P
    Level 36  
    Grzesio70 wrote:
    on the box it says that it charges with electricity min. 0.8A 12V.

    I have no idea how you can determine the min.
    To force the minimum current, the charger would have to increase the voltage to force the current. So it would kill batteries :)
    Here probably "specialist, ladybug translator", humanist, got lost in the terms.
    It was meant that the charger had a current of at least 0.8A. If the battery needs it.
    Or it turns off at a current below 0.8A because the charger finds that the battery has charged ;) That would be such a "ficzer" ;) I do not know the parameters of this charger.

    And all in all, call the store manager and ask and record the answer :)
    I once heard a translation of a customer service at an electronics booth to a customer. Until I stopped to listen and pretend even interested customer, but completely green. Interesting experience. I hope I found a replacement ...
  • #5 17334024
    Grzesio70
    Level 12  
    I don't know if we understand each other well, it's about two different chargers. The one from "Biedronka" has the following description on the box: "max. 2 / 4A 12V".
    I can borrow from my colleague another automatic charger called "BC-something", which has clearly written on the packaging:
    min. 0.8, max 3.8A 12V.
    So from a friend's post it follows that the one from "Biedronka" should be described: 0-2A motorcycle and 0-4A car at 12V.
    As for information from store employees, it rather doesn't make sense.
  • #6 17334036
    mariuszp19
    Level 35  
    Grzesio70 wrote:
    So from a friend's post it follows that the one from "Biedronka" should be described: 0-2A motorcycle and 0-4A car at 12V.


    That's exactly how it should be described.
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  • #7 17334138
    gumisie
    Level 43  
    Grzesio70 wrote:
    I am asking because I want to use this charger to charge 6 and 10A motorcycle batteries. The rule is that the current value up to 1/10 of the battery capacity.
    The unit of battery capacity is: Ah or mAh and nothing special about the charging current (0.1C) has changed.
    Parameters given on this type of chargers are a typical marketing ploy, but we should be aware of the fact that such a charger should not be charged with a higher current than declared by the manufacturer.
    Regards
  • #8 17334198
    Grzesio70
    Level 12  
    An oversight, of course, that it is about the battery capacity expressed in "Ah", I have already corrected.
    And out of curiosity, information for the layman, how can one load the automatic charger above the value declared by the manufacturer? In this particular case, 4A.
    Regards!
  • #9 17334364
    Jawi_P
    Level 36  
    Grzesio70 wrote:
    And out of curiosity, information for the layman, how can one load the automatic charger above the value declared by the manufacturer? In this particular case, 4A.

    Even connect a fully discharged high capacity battery.
    It's just that all those chargers, and in fact converters, will limit the current to their rated and will probably not give more.
  • #10 17334617
    gumisie
    Level 43  
    Jawi_P wrote:

    Even connect a fully discharged high capacity battery.
    He would not risk, though:
    Jawi_P wrote:
    It's just that all those chargers, and in fact converters, will limit the current to their rated and will probably not give more.
    Give it confidently and they won't, maybe it will work "current protection", but they also have the right to be completely destroyed.

    ps

    A "completely discharged" battery is more eligible for utilization than for any experiments.
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  • #11 17334659
    Jawi_P
    Level 36  
    gumisie wrote:
    Give it confidently and they won't, maybe it will work "current protection", but they also have the right to be completely destroyed.

    It may be as you say, but it would have to be some total "shit". We know that short-circuit protection is no problem, I saw these "ladybug" inventions from 3 pcs, one I have at home. All short-circuit proof, they don't even provide voltage without a battery connected. Well, but everything is possible.
  • #12 17334690
    gumisie
    Level 43  
    Jawi_P wrote:
    All short-circuit proof, they don't even provide voltage without a battery connected.
    And this is the advantage of so-called rectifiers; "Automatic".

    "Lord, I think the rectifier broke!" When I short-circuit black and red, "it doesn't spark." :D
  • #13 17335320
    Wlodek22
    Level 31  
    Grzesio70 wrote:
    Hello!
    Has anyone of your colleagues measured and know the minimum current at 12v in this rectifier.

    I measured, but now I don't remember exactly. Something about 0.5A, but this is the current at which the charger indicates the end of the charging process. You as a user have no influence on this. You can only choose 2A or 4A. For example, you choose 2A, so up to a voltage of 13.8V, the current will be 2A, and after exceeding this voltage, the current will be reduced up to the threshold of 14.5 / 14.7V and 0.5A. Unfortunately, the battery will still be overcharged. In addition, it overheats and reduces the charging current. With larger batteries instead of the set 4A, it charges with an average current of 1.4A.
    Look for other solutions. E.g. regulated power supply, or small step down converter with current and voltage regulation + power supply e.g. from laptop. You can also use an ordinary rectifier and limit the current, e.g. 5-10W light bulb.
  • #14 17338824
    Grzesio70
    Level 12  
    I thank my colleagues for interest and information, I cordially greet and close the topic.
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Topic summary

✨ The discussion revolves around the Sena z Biedronka Automatic Rectifier, specifically its minimum current output for charging 12V motorcycle batteries with capacities of 6-10Ah. Users express uncertainty regarding the minimum current specification, as the manufacturer only provides maximum current ratings of 2A and 4A. Some participants suggest that the charger may operate at a minimum current of around 0.5A, which is the current at which it indicates the end of the charging process. Concerns are raised about the potential for overcharging and overheating, particularly when using larger batteries. Alternatives such as regulated power supplies and current-limiting methods are recommended for safer charging practices. The conversation highlights the importance of understanding charger specifications and the implications of using them with different battery capacities.
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FAQ

TL;DR: Measured termination current is ~0.5A, and “You can only choose 2A or 4A.” For 12V 6–10Ah motorcycle batteries, this automatic unit reduces current near 13.8–14.7V and ends around 0.5A; consider 0.1C guidance. [Elektroda, Wlodek22, post #17335320]

Why it matters: Riders charging 12V 6–10Ah motorcycle batteries need safe current limits and realistic behavior expectations from budget automatic chargers.

Quick Facts

What’s the actual minimum current this "Biedronka" automatic charger delivers at 12V?

Users measured the effective minimum (termination) at about 0.5A. You cannot set a lower constant current. “You can only choose 2A or 4A.” The device tapers near end-of-charge and stops around that 0.5A threshold. That minimum is not user-adjustable. [Elektroda, Wlodek22, post #17335320]

Can I use it to charge 6Ah and 10Ah motorcycle batteries safely?

Yes, it can charge both capacities. The battery will take more current only briefly, then the draw falls. Your motorcycle’s charging system behaves similarly. For small batteries, keep an eye on temperature and charge duration. Use the 2A mode if available. [Elektroda, Jawi_P, post #17333600]

What does “max 2/4A 12V” really mean for motorcycles versus cars?

It denotes current limits, not guaranteed delivery. Expect approximately 0–2A in motorcycle mode and 0–4A in car mode, depending on battery state. Actual current varies during the charge cycle. That’s the correct way to read the label. [Elektroda, mariuszp19, post #17334036]

Does this model have a guaranteed “minimum 0.8A” like some chargers?

No. “Minimum current” claims often confuse capability with behavior. Forcing a minimum current would require raising voltage, which risks battery damage. Some chargers simply shut off below a threshold current, interpreting that as full. This unit does not expose a user-settable minimum. [Elektroda, Jawi_P, post #17333941]

How does the charging algorithm behave (voltages and taper points)?

In 2A mode it holds about 2A until ~13.8V, then reduces current. It tapers down as voltage rises toward ~14.5–14.7V. Termination occurs near ~0.5A. The same logic applies when 4A is selected, just with a higher initial limit. Values are approximate, based on measured behavior. [Elektroda, Wlodek22, post #17335320]

Could it overcharge a small lead-acid battery?

Yes, overcharge is possible with this unit. “Unfortunately, the battery will still be overcharged.” Stop charging once it indicates full. Avoid leaving a small motorcycle battery connected for extended periods. Monitor temperature and voltage if possible. [Elektroda, Wlodek22, post #17335320]

Why do I sometimes see only ~1.4A even when 4A is selected?

Heat can cause internal limiting. The charger may reduce output as it warms. With larger batteries, users observed an average of about 1.4A on the 4A setting. That reflects thermal protection behavior, not a fault in the battery. Allow ventilation to help. [Elektroda, Wlodek22, post #17335320]

Is it short-circuit protected and safe with no battery connected?

Yes, reported units include short-circuit protection. They don’t provide output voltage without a battery connected. This helps prevent sparking and accidental shorts during hookup. Still connect clamps correctly, red to positive and black to negative. [Elektroda, Jawi_P, post #17334659]

Can connecting a fully discharged high-capacity battery damage the charger?

Risk exists even if current limiting is present. Protective circuits may help, but cheap converters can still fail under stress. “A ‘completely discharged’ battery is more eligible for utilization than for any experiments.” Avoid using zero-volt batteries with automatic chargers. [Elektroda, gumisie, post #17334617]

What current should I target for 6–10Ah batteries if I want to be gentle?

Aim for about 0.1C. For 6–10Ah, that’s ~0.6–1.0A. This charger does not hold a constant 0.8–1.0A; it uses 2A or 4A and tapers. If you need strict 0.1C, consider different equipment. Always verify battery temperature during charging. [Elektroda, gumisie, post #17334138]

How do I charge a motorcycle battery with this unit step by step?

  1. Select 2A mode for small 12V batteries.
  2. Connect leads and charge; it holds current until ~13.8V, then tapers.
  3. Stop when the indicator shows full, or current nears ~0.5A around ~14.5–14.7V. [Elektroda, Wlodek22, post #17335320]

What can I use if I want a precise 0.8–1.0A charge?

Use a regulated supply or a small step-down converter with voltage and current control. Power it from a laptop adapter. This gives you a settable current and voltage, matching 0.1C recommendations. It’s inexpensive and flexible for small batteries. [Elektroda, Wlodek22, post #17335320]

Will store staff know the exact minimum-current spec?

Packaging and translations often misuse terms like “min current.” Don’t rely on box wording alone. If needed, “call the store manager and ask.” Better yet, consult the manual or measurements. Community reports remain valuable for clarity. [Elektroda, Jawi_P, post #17333941]
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