Rechargeable Lithium-Ion 400mAh AAA Batteries (4 Pack) $11.99 Delivered w/ FIRST ($49.99 + $11 Shipping Non-Members) @ Kogan NZ

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• 

  bigcheese on 17/06/2025 - 11:28

  Note the previous deal were 1400mAh - these are 400mAh so won't last as long.

  • 

    ace310 on 17/06/2025 - 11:29

    +2

    Previous deal was for AA batteries. These are AAA

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  justaddwater on 17/06/2025 - 11:44

  400mah very small or is it just me?

  • 

    danvelopment on 17/06/2025 - 12:13

    Yep, half the capacity of normal NiMH AAAs.

    • 

      scott on 17/06/2025 - 12:38

      These are 400 mAh @ 1.5 v = 600 mWh

      AAA eneloop (white) are 800 mAh @1.2v = 960 mWh

      So ~ 2/3rds of the capacity….

      if one cars about capacity, Pale blue Lithem AAA are 600 mAh / 900 mWh, and Eneloop Pro's are 950 mAh / 1140 mWh

      • 

        danvelopment on 18/06/2025 - 08:57

        Hmm, this is an interesting subject but there's a flaw in your calculation for the majority (maybe all?) use cases.

        The current draw doesn't necessarily change on devices between the two voltages, for example, if you plugged in an Arduino, the voltage regulator would dump the extra voltage as heat and the current would be the same between two devices. Without a voltage regulator, the chip may run slightly faster but still consume the same current (although it would fall the idle sooner if it got the work done sooner), or it, too, would dump the difference as heat.

        Meanwhile, if you plugged it into, say, a Tamiya car (electric motor), the current, again, would stay the same but the motor would run faster.

        So the current capacity is the true capacity, not the power capacity.

        If you're deciding between a 12 and 24V system, for example, the power capacity is a valid comparison, but these batteries are fitting into a use case where the device can run at 1.2V.

        That's why EVs, for example, talk about kWh battery capacity and not Ah, because the voltage of the battery and the motor are paired, but differ between vehicles, and the load is based on both of those (less power = lower current). So the power capacity is a truer representation.

        But things that take AAA batteries are designed to operate across a range of voltages, and instead their performance may change (or they'll dump the difference).

        It's also why things that operate at a fixed voltage (mobile phones, power banks etc) advertise their current capacity and not their power capacity.

        Realistically it would have had more true capacity if they'd stepped down to 1.2V instead of 1.5V.

        • 

          scott on 18/06/2025 - 10:25

          @danvelopment: My thoughts are that power is the fairest way to measure.

          My thoughts are that AAA taking devices which simply dump the excess voltage as heat are relatively rare, and for devices that just vairy their outputs based on voltage (Incandescent lights, cheap motors etc), the greater voltage and hence greater output are a major selling point of the LiIon based AAA batteries, compared to NiMH like eneloop. And as such the extra power should be recognised as providing greater utility, even if the run time is not as long. With Alkaline AAA, some appliances require the batteries swapped far before they are empty, simply because the appliance preforms poorly at low voltage.

          • 

            danvelopment on 18/06/2025 - 11:12

            @scott: Sure but higher voltage = better experience doesn't factor into a capacity question.

            At no point did you say "yeah but it may/will run better at 1.5V"

            And no one is running incandescent lights on a AAA.

            Not assuming a spherical cow to justify your irrelevant numbers argument.

  • 

    scott on 17/06/2025 - 12:34

    Pale Blues equivalent is 600 mAh, so these are small, but not shockingly so.

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  mingyu01 on 17/06/2025 - 11:56

  Is it just me or the link is pointing to the Kogan AU?

  • 

    danvelopment on 17/06/2025 - 12:16

    This is also true, the cart says "One or more items in your cart aren't available to ship to your postcode."

    I mentioned this the other day, Kogan AU has a lot of value for First, but NZ is pretty much worthless.

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  mpc on 17/06/2025 - 12:40

  These ones are $10 on the NZ site and 1350mah but obviously not usb-c chargeable:

  https://www.kogan.com/nz/buy/auhsh-4pcs-aaa-1350mah-ni-mh-12…

  No idea if they're any good…

• 

  NovaAlpha on 17/06/2025 - 15:44

  How is Kogan advertising these as fast charging when it takes 2 hours to charge a 400mAh battery? That's slow AF. It takes like 45 mins to charge my 5500mAh phone.

  How often do people really benefit from rechargeable batteries these days? Most modern devices already come with built-in rechargeable batteries, so swappable ones are becoming less common. And even when you do need AA or AAA batteries, the need to swap them out is so infrequent that it might be more practical to just use disposable ones. They're cheap, readily available, and you avoid the hassle of waiting two hours for a recharge.

  • 

    danvelopment on 17/06/2025 - 16:55

    I would guess they're comparing them against other AAAs (eg NiMH) which are often "dump power into them for 4-8 hours and they're probably done"

    I have a few AAA devices,
    - my Bose QC15s
    - TV remotes
    - Android box remotes
    - Baby temperature sensor
    - Long distance temperature sensor
    - Laser level

    I personally prefer rechargeables on a waste basis, and I have a 4x cell li-ion/NiMH dual charger on my desk plugged into a USB via my monitor that I use to charge the QC15s (which need a charge every 2-3 days) which charges a lot faster than 2-8 hours because it actually monitors voltage.

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  mastersm on 18/06/2025 - 08:48

  I've bought a few of these
  https://www.marine-deals.co.nz/usb-rechargeable-aaa-lithium-…

  They're often on special for $14.99 and are 550mAh