Integrated Battery Pack for the Lab599 Discovery TX-500

A new item arrived on my doorstep this week.

Brewer 3D Design (hyperlink), a seller on, has created a few accessories for this rugged and capable radio including screen covers and caps for the connectors. They recently added a battery pack for the radio that makes using it in the field that much more convenient.

From their posting:

While the world waits patiently for the OEM battery pack from Lab599, I decided to build my own based on their initial renderings.

Brewer 3D Designs

So what did I get in the mail today?

I received a well designed, 3D printed (in ABS) battery pack that mounts via the included hardware directly to the back of the radio.

Also in the box is a 3D printed radio stand that tilts the radio back into a comfortable operating position, and a hang tag that lists a serial number (mine is 0006 which I assume means that this is the 6th one sold) and thank you note from the seller, and two (spare I assume) magnetic connectors that align to the connections on the back of the radio.

The specs as noted by the seller are:

  • 4000 mAh capacity
  • 9-12.6 volts
  • Li-Ion polymer cells (PL-605060-2C)
  • 3S2P configuration
  • Included BMS
  • 5.5mmx2.1mm charging jack

Mounting the battery pack requires the removal of the 4 rubberized feet on the back of the radio which exposes 4 tapped holes which are there for future accessories. Installation is simple – use the 4 included screws to attach the battery pack to the radio via the now exposed holes. Make sure that you align the connections properly. They are magnetic so you will feel a slight attraction as they line up.

Note that no instructions are provided with the radio, but mounting and operation is quite straightforward. For the switch, one direction enables power to the radio while the other allows for charging. HINT: sliding the switch towards the center of the pack powers the radio. Towards the outside is for charging.

Also note that installing the battery pack makes the built-in tilt legs non-operable – they are blocked by the battery pack. That is what the included stand is for.


Measuring the pack with my cheap calipers, I get the following measurements:

  • 17.1mm thick (top to bottom), compared to 21mm for the radio itself
  • 79.5mm wide, compared to 90.5mm for the radio
  • 197mm long, compared to 205mm for the radio (not including the connections in the measurement)

Attaching the pack almost doubles the thickness of the radio itself, but doesn’t add any additional width or length.

The print resolution seems to be quite fine, with all layers uniform and no visible separation or flaws that would affect durability or longevity. The lines and edges are smooth. All parts mate up uniformly and without gaps.

The case is held together with screws that are connected to threaded inserts in the ABS – no direct screw to plastic contact. Nicely done!

On the inside, this is what you’ll find:

The BMS appears to be this one on Amazon (hyperlink), or at least something similar.

Specs from that listing are:

  • 3 strings: 3 18650 batteries or polymer lithium batteries in series
  • Polymer battery rated voltage: 10.8V
  • Rated voltage of 18650 or 3.7V lithium battery: 11.1V
  • Maximum discharge current limit: 10A
  • Maximum working current: 5-8A

Upon full charge the battery bank should have about 12.6 volts.

Final Thoughts

KB7MBD at Brewer 3D Design has created an extremely well thought-out design and has implemented it quite well. The design is a good balance between utility and matching of the TX-500’s aesthetics. I haven’t had enough time yet to determine how the battery holds up, however I am convinced that the capacity (about what I normally carry outside) combined with the convenience will mean that this is a power pack that I can use for multiple POTA activations. Further testing will be required which I guess means more time playing radio.

Bummer 😉

I also need more time to determine if the BMS is RF quiet or not – I don’t foresee any issues there but is always a concern with anything electrical that is attached to our radios.

At the end of the day, it is exactly what it is advertised to be; namely a rechargeable battery pack that fits the TX-500 like an OEM accessory.

The pack can be purchased via their Etsy site, though availability determines whether it shows up in their listings or not. Also for anyone outside of the US, at the time of this writing the seller offers a “kit” version that doesn’t include the battery cells themselves.

Expect a follow up after some field time!

Additional Images

Ignore my thumbprints at the bottom – embarrassing.

UPDATE – 2022/03/11

After posting this I started to receive multiple inquiries about the availability of this product in the vendor’s store. I should point out that I have no affiliation with the vendor, and therefore have no visibility into whether it is available or not at any given time.

My working assumption is that like many vendors on Etsy, items only appear as they are available and ready for purchase.

You can see the vendor’s shop at

There is contact information there which you can use to reach out and verify availability.

Shameless Plug

If you like what you read on my site, consider buying me a coffee (well, I don’t actually drink coffee, but a soda would be nice) at I don’t use advertising and anything reviewed is done with items purchased myself.




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7 responses to “Integrated Battery Pack for the Lab599 Discovery TX-500”

  1. arkpat Avatar

    Reblogged this on Site Title.


    1. Tom Avatar

      Is this battery pack still available for purchase? I can’t seem to find it anywhere


      1. Adam Dooley Avatar

        Hi Tom,

        Please note my update at the bottom of this post. I do not have any affiliation with the vendor, and have seen the item come and go at various times which leads me to believe that it is only shown on their storefront when there is an item available for immediate purchase.



  2. Justin Avatar

    What’s the weight on the battery pack? Also, have you gotten a chance to test the battery life over the past 6 months?


    1. Adam Dooley Avatar

      Hi Justin.

      The pack is 11.4 ounces or 323 grams on my inexpensive kitchen scale.

      I have used it a couple of times since purchasing, though I tend to leave it unattached and grab an external battery mostly. Because of that I haven’t used it enough to determine how much I can get out of a single charge. I’ve used it for CW work for a couple of hours without it dropping significantly (but I haven’t logged by how much so I cannot quantify it)

      I’ve found that I both like and dislike the battery pack. On the plus side it is well made and fits the radio nicely. On the other hand it is not weather resistant which is something I like about the radio itself – it provides some resistance to the elements which is part of its appeal.

      Having the battery attached means that while the radio maintains its weather resistance, the battery pack is not and if water does make its way inside then a short could cause devastating results for both it and the radio.

      At least with an external battery I can keep them separate and minimize the potential.

      How likely is that to happen? Since I pack things nice and tight inside dry bags probably not very likely, but I’ve got a healthy paranoia for expensive toys that I take outdoors and like to protect them at all costs.

      I stand by my initial findings that it is well made and fills a need. I just don’t know that for my uses it checks enough boxes to be attached full-time for every outing.

      As for battery life, you’ve reignited my interest in this battery so I will have to do some tests and see what happens.


  3. Eric Avatar

    Any interest in selling the battery pack?


    1. Adam Dooley Avatar

      Hi Eric.

      I have previously considered it but have decided hold onto it for now.

      Thanks for checking though.


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