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Redox Alpha V2: Charging AA Batteries & SYMA Drone Battery Pack with 4AA Holder (Eneloop)

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  • #1 16676756
    Anonymous
    Level 1  
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    #2 16676793
    1 PAWEL
    Level 42  
    Not too high charging current if they are to withstand longer without significant loss of capacity,
    yes up to 500mA depending on the capacity of AA batteries discharge up to 1.0V (0.9V max.)
    For new ones, with 0.1C current, and discharging with 0.2C current to 1.0V.
    0.9V / cell is already a strong discharge.
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    #3 16676801
    arturdip
    Level 31  
    After all, the charger manual says that it can charge virtually any cells from 1 to 15 with a current from 0.1 to 5 A. So I do not see any problem (you should probably program the number of cells and charging current).
    number of supported NiCD / NiMH cells: 1 ~ 15 cells
    number of supported target Li-Po / Fe / Ion: 1 ~ 6 cells
    supported Pb batteries: 2 ~ 20V
    built-in charger memory: max. 5 packages
    packet cycling function
    4 programming buttons
    dimensions: 134 x 86 x 26 mm
    working voltage: DC 11.0 ~ 18.0V
    weight (without cables): 400 g
    max. charging power 50W
    max. discharge power 5W
    charging current: 0.1 ~ 5.0A
    discharge current: 0.1 ~ 1.0A
    balancing current: 300 mAh / cell
  • #4 16676811
    1 PAWEL
    Level 42  
    arturdip wrote:
    (you probably need to program the number of cells and charging current)


    You should definitely set the type of battery, the value of the charging current, and the voltage will be set by the charger itself.
  • #5 16676817
    Anonymous
    Level 1  
  • #6 16676824
    1 PAWEL
    Level 42  
    You can use the crocodile clips to pick up the connector or make a connector.
    Beware of polarity, the recommendation is to connect the batteries with the charger turned on.
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  • #7 16676840
    Anonymous
    Level 1  
  • #8 16676855
    1 PAWEL
    Level 42  
    I had them in the set - Redox Alpha V2 charger
    12V DC power cord (Jack - Crocodile clips)
    1 x Gold 4 mm adapter - DEAN plug
    Additional extension adapters for the Gold 4 mm adapter - DEAN plug:
    1 x DEAN Socket Adapter - Crocodile Clips
    1 x Adapter DEAN Socket - Servo Socket (futaba)
    1 x Adapter DEAN socket - Dummy candle (for charging 1.5V clips)
    1 x Adapter DEAN Socket - Tamiya Plug (large)

    Redox Alpha V2: Charging AA Batteries & SYMA Drone Battery Pack with 4AA Holder (Eneloop)

    You can buy any other connectors you need by yourself and adapt it to your needs.

    Redox Alpha V2: Charging AA Batteries & SYMA Drone Battery Pack with 4AA Holder (Eneloop)
  • #9 16676875
    Anonymous
    Level 1  
  • #11 16676886
    Anonymous
    Level 1  
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  • #15 16676986
    Anonymous
    Level 1  
  • #16 16677320
    teskot
    Rest in Peace  
    If I can, I would hook up to the topic. I have such a charger and so far I have used it only for lithium and lead batteries. It worked flawlessly. However, at the moment when it was necessary to recharge the Ni-MH pack, the stairs began. While in the case of the aforementioned batteries, the number of cells is determined and the charger ends the charging process at the final voltage specified for the package, in the case of charging the Ni-MH package, it is not possible to set the number (voltage) of cells. So the charger charges them or unloads them until their death. Do I need to set a time or capacity limit in this case?
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Topic summary

✨ The discussion revolves around using the Redox Alpha V2 charger to charge both AA batteries, such as Eneloop, and a SYMA drone battery pack using a 4 AA holder. Users are advised to set the appropriate battery type and charging current, with a maximum charging current of 500mA recommended for AA batteries to prevent capacity loss. The charger supports various battery types and configurations, including NiCD, NiMH, Li-Po, and lead batteries. Users can connect batteries using crocodile clips or custom connectors, which may need to be purchased separately. The importance of polarity and proper settings for charging Ni-MH packs is emphasized, with suggestions for monitoring charging limits to avoid overcharging.

FAQ

TL;DR: Redox Alpha V2 supports 1–15 NiMH cells; "charging current: 0.1–5.0 A"—set chemistry, set current, and connect with correct polarity. [Elektroda, arturdip, post #16676801]

Why it matters: This FAQ shows beginners how to safely charge AA Eneloops and a SYMA pack using a 4×AA holder without damaging cells or gear.

Quick Facts

How do I wire a 4×AA holder to the Redox Alpha V2?

Use crocodile clips or a matching lead from the charger to the holder’s red (+) and black (−) wires. Confirm polarity before starting. “Beware of polarity, connect with the charger turned on.” This lets the display confirm a correct hookup before charging. [Elektroda, 1 PAWEL, post #16676824]

What settings should I use to charge AA Eneloop (NiMH) cells?

Select NiMH mode and set charge current near 0.1C. For 2000 mAh AAs, set about 200 mA–500 mA. For capacity checks, discharge to 1.0 V per cell; 0.9 V is already heavy and may shorten life. How‑To: 1. Insert cells in the 4×AA holder. 2. Connect observing polarity. 3. Choose NiMH, set 0.1C, start. [Elektroda, 1 PAWEL, post #16676793]

Can I charge a SYMA drone battery pack with this charger?

Yes. Alpha V2 supports Li‑Po/Li‑Ion/Li‑Fe packs from 1–6 cells and up to 50 W. Select the correct chemistry and cell count for your SYMA pack, then set the current within the pack’s rating. Start the charge and monitor. [Elektroda, arturdip, post #16676801]

Does the Redox Alpha V2 include crocodile clips and adapters?

Many kits include a DC lead with crocodile clips, a 4 mm banana to DEAN adapter, and extensions like DEAN‑to‑clips, DEAN‑to‑servo, and DEAN‑to‑Tamiya. Check your box contents; variants exist. [Elektroda, 1 PAWEL, post #16676855]

Do I need to buy extra cables?

If your kit lacks the lead you need, buy or make the correct connector. The charger uses 4 mm banana outputs and DEAN/T adapters are common. Custom leads are widely available if your holder or pack uses a different plug. [Elektroda, 1 PAWEL, post #16676883]

Which connector should I buy for a 4×AA basket?

Options: use a DEAN (T) plug lead that mates with the charger’s adapter, or a simple 4 mm banana lead and solder it to the basket’s red/black wires. Choose what matches your existing adapters. [Elektroda, 1 PAWEL, post #16676925]

What chemistries and cell counts does Alpha V2 support?

It supports NiCd/NiMH 1–15 cells, Li‑Po/Li‑Fe/Li‑Ion 1–6 cells, and lead‑acid 2–20 V. This covers common RC, AA/AAA, and small drone packs, within 50 W charge and 5 W discharge limits. [Elektroda, arturdip, post #16676801]

What’s a safe discharge cutoff when testing AA cells?

Use 1.0 V per cell as the discharge endpoint for NiMH AAs during capacity tests. 0.9 V per cell is already a strong discharge and can reduce longevity, so avoid going lower unless necessary. [Elektroda, 1 PAWEL, post #16676793]

NiMH program seems endless—how do I avoid overcharge?

Use the charger’s NiMH mode and follow the setup in the referenced instructions. If your workflow needs safeguards, enable capacity or time limits as described in the guide linked in the discussion. This keeps older packs from being overworked. [Elektroda, 1 PAWEL, post #16677347]

What are the charger’s power limits and balancing current?

Alpha V2 delivers up to 50 W charge and 5 W discharge. Balance current is 300 mA per cell for lithium balancing. This matters for large packs; a 50 W cap limits high‑capacity charge rates. [Elektroda, arturdip, post #16676801]

Should I connect with the charger powered on or off?

Connect with the charger powered on so you can verify polarity and program settings before applying current. As the expert notes, “Beware of polarity,” to avoid shorts and cell damage. [Elektroda, 1 PAWEL, post #16676824]

Can I clip directly to the 4×AA holder’s two wires?

Yes. The typical 4×AA holder presents just two leads: red (+) and black (−). Clip to those leads or solder a compatible connector, then select NiMH mode and start at 0.1C. [Elektroda, Anonymous, post #16676893]

What if I need a custom cable for an unusual plug?

Suppliers can make unusual adapter leads, or you can specify connectors and have a cable built. Share your plug type or a photo with the vendor to get the right lead the first time. [Elektroda, 1 PAWEL, post #16676890]
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