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A123 2500 MAH RX Battery

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  • GENUINE A- Grade A123 system cells. Not fakes! Soldered and weld tabs with 4MM foam padding for extra protection in high vibration environments.
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Product Description

Here at TAILDRAGGER RC we have our exclusive A123 Systems 2500 MAH Battery Pack!! These are the latest in 2012 for A123 Systems Packs. New capacity @ 2500 MAH and even more robust with lower IR than the older 2300 MAH cells!!


                                                                                                                                SOME SELL B-GRADE CELL PACKS THAT ARE REJECTS

                                                                                 KNOW WHAT YOU ARE BUYING HERE! WE SUPPLY AND SELL A123 SYSTEMS BATTERIES AND PACKS!



WHY BUY OURS??These packs are made of quality genuine brand new A123 ANR26650M1B cells*our exclusive packs with (A) Grade A123 Systems Cells (not the B-grade packs and the cells are built to a higher spec!-Two connectors on the battery- A 22 AWG with a universal connector for standard applications and a 14 AWG with a deans style connector for High current applications.


  • -Wires on the connectors are longer for a longer reach.
  • Genuine A123 Systems 2500MAH cell battery packs. Don't be fooled by the "LIFE" batteries these are the real deal. These batteries can carry the current without dropping voltage for today's highest RX, digital servo power applications such as today’s 50cc-150cc aircraft can provide. These batteries also have a balance tap for cell balancing. INCLUDES BOTH high current (T- PLUG) AND JR STYLE PLUG FOR POWER OUTPUT!! Balance taps also fit our G>T> POWER multi charger we carry!!


-2500 MAH - RX 2 cell 6.6volt - 2s1p
-Continuous discharge- 30c
-Max Discharge Continuous - 60-120c
-Weight: 150g
-(T- plug) w/ 14 AWG wire 
-22 AWG Jr style power wire also
-JST Style Balance Tap

Genuine A123 LiFePO4 2-cell 6.6V battery pack, with JST-XH balance connector, genuine Deans Ultra connector and separate JR connector lead. Built from genuine A-grade A123 cells. These packs are made from the new A123 M1B cells which have a slightly higher capacity of 2500mAh compared to the old 2300mAh.


A123 LiFePO4 battery packs make great fast-charge receiver batteries and hold their charge superbly. Please check whether your receiver and servo's will require a voltage regulator before using the pack to power your receiver and servos. A123 batteries offer excellent voltage stability under load, lending themselves very well to airframes with high servo loads.


Fast charge is possible using A123/LiFePO4 compatible chargers. Please do not attempt to fast charge A123 battery packs using the balance connector alone, as the balancing wires are not generally suitable for currents above 1A. The maximum charge voltage per cell for these A123 cells is 3.6V per cell (7.2V total) 


A123 batteries have a very flat discharge curve and therefore using the voltage to check remaining capacity is not reliable. We suggest to fully charge and then after first use, re-charge and monitor the number of MAH put back into the pack to develop an understanding of how many flights you can have between recharges. For 50cc models, it is normally possible to have at least 4 flights comfortably before a recharge is required – you can then recharge at up to 10A and be ready to go again within 20 minutes!


Nominal pack voltage: 6.6V (3.3V per cell)Fully-charged pack voltage: 7.2V (3.6V per cell)Recommended cut-off voltage: 5V (2.5V per cell)Minimum voltage: 4.0V (2.0V per cell)


If swapping the  (T- plug) on this pack for another type of connector, remove the existing plug by cutting one wire at a time, to avoid shorting the pack. Or de-solder the existing T-Plug carefully after cutting the heat-shrink.ONE YEAR BATTERY EXCHANGE WARRANTY ON SOLDER COMPONENTS AND CELLS!!




New INFO: Many ask, "Chad I hear from many that you cant voltage test A123 batteries. I do not feel comfortable about this chemistry because I cant volt or load check in between flights"


First of all, years back we flew NICD and NIMH Battery chemistry. Due to the high internal resistance and especially under a flight load there was a need to LOAD test them between flights. With today's 2.4 radio technology we have, the high power 300+ ounce digital servos, and large control surfaces a high IR NIMH pack can jump from 6.0 volts to 3 volts or less in a snap roll! Then what happens is an ultimate an untimely "brown out" The GENUINE A123 technology while utilizing a high current rx connector can handle up to 120A bursts making this illogical to happen!

Are these the same as the LIFE/Lifepo 4 packs? A resounding NO!  Soft pack "life" packs are not as superior as genuine A123 cells. Often cell match is weaker as is output discharge capabilities. Most are also fragile "soft" type packs. With that said if it is NOT labeled as a 1100,2300,2500, or 4600/5000 4 cell A123 pack, and not a cylinder shaped cell, it is more than likely LIFE and not A123 cells inside the pack!


There is NO NEED to voltage test them. Fly a set number of flights and count charge milli-amps between flight. Say you burn 300 MAH per flight you cna fly a set number of 4-5 flights before you should be concerned about a re-charge.
A123's (real ones) have a flat line curve and that is what actually makes them so desirable. They stay at 6.6 VOLTS Most of their cycle life while being discharged in flight up to 30 AMPS continuous! No matter what you throw at them amp wise they remain 6.6 volts under a constant load.
No need to voltage test them. Just charge them.

This is a false worry that has been going about them since 2008 and it needs to be embraced as the reason why the chemistry is one of the most superior ones!


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Product Reviews

Showing reviews 1-10 of 20 | Next

  1. 1-2-3 power is there 5 Star Review

    Posted by on 25th Apr 2018

    These are excellent batteries for both receivers and ignition set-ups in RC Planes. You can probably do most of your days flying without having to worry about recharging battery. A definitely quality battery.

  2. Quality A123 Battery 5 Star Review

    Posted by on 20th Jul 2017

    I have purchased a dozen or more of these A123 batteries. I use these in my jets mostly, two of the 6.6 volt for receivers and a 9.9 volt for the turbine. They are high quality and competitively priced. Never had any problem and highly recommend them.

  3. Taildragger is awesome 5 Star Review

    Posted by on 13th Jun 2017

    Forgot to mention the awesome service Taildragger provides. Not many places you can call in this world and feel as welcome and appreciated for your business. I ask you is anyone nicer than Natasha!!!!

  4. A123's why use anything else 5 Star Review

    Posted by on 13th Jun 2017

    Have been using A-123's for many years and have been fantastic. Tough & Safe system easy to charge and maintain. Nothing on the market I'm willing to change over to yet. Lipo have there place but just love A-123s.

  5. Great "real" A123's! 5 Star Review

    Posted by on 9th May 2017

    I have used these in the past and they work great! Thanks Chad for a high quality product.

  6. A123 2500 5 Star Review

    Posted by on 29th Mar 2017

    Talked with Chad...He took the time to fully explain what would be my best option for my plane. He didn't try to oversell me on the batteries. Taildraggers is a very reputable company, and highly recommended on many websites I have visited. I have no worries in the quality of this product. I am sold on Taildraggers products and service.

  7. A123 -Is there any other battery? 5 Star Review

    Posted by on 24th Mar 2017

    I try not to run any other battery but A123 in my planes. They are more dependable. Hold charge longer, charge quicker and are a very trustworthy battery. None better!

  8. A123 2500MAH 5 Star Review

    Posted by on 9th Mar 2017

    These battery charge quickly and hold it. We use them for combat robots. They get abused and keep working.

  9. Taildragger A123 Batteries 4 Star Review

    Posted by on 28th Sep 2016

    The Taildragger A123 batteries are a good choice for both giant scale warbird and large 3D airplanes. I use dual 2500 mAh batteries with separate charge/switches and battshare. Good batteries at a good price. Very friendly people to deal with and good customer service.

  10. Taildragger A123 battery packs 5 Star Review

    Posted by on 18th Jul 2016

    I have used pretty much all the battery types that are out there and I settled on the A123 packs from Taildragger RC to power my new 1/4 scale AT6. I like how they hold there charge for long periods of time without being constantly tended to. I have enjoyed using the Relion Lipo packs in the past but seemed to always be loosing an expensive pack to low voltage. A switch would get left on or bumped to on in transit and the voltage would drop to zero or so low that you couldn't bring them back. I had an A123 pack that sat on an ignition system for 2 years and when I checked it it still load tested good. I actually flew the pack a couple of flights because I didn't yet have a charger that would handle A123s. (Not recommended, but you know how we are sometimes) I do now have proper chargers. I like the way that A123 hold a constant voltage and amperage draw for the duration of its charge. Yes when they fall off they drop drastically, you just have to know your packs and know how much you've used out of it.
    I am totally impressed with Taildragger and there service levels. They have earned my business and I appreciate my new friends in the RC business.
    Charles Wright

Showing reviews 1-10 of 20 | Next

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