[MRCA] Prc-25 battery question

[Clare Owens]

I received this battery case with a NOS? PRC-77 from a Japanese ebay
seller.  It is for 4 18650 batteries and apparently was made by 3D
printing.  Seems to work fine and has the resistance in the 3V line.  Only
problem is that the '25 and '77 are analog, with no low battery alarm so it
is too easy to drain the batts below their 2.5V minimum and thus ruin
them.  It is identical in size to the BA-5598.  And I do not want to sell
it.

Clare. N2RJB

On Wed, Apr 22, 2026 at 7:50 PM Tim via MRCA <mrca at mailman.qth.net> wrote:

> Hi Dave ..My PRC-25 is powered by 2 “D” Cells in series (with a DIY 1 ohm
> resistor in series) for the 3 volt 2DF4 TX tube filament and two 6 volt,
> 4.5 A-H Gel Cells (Power Sonic PS640F-1) in series for the rest of the
> electronics. It all fits in the stock battery box and I can charge the Gel
> Cells by connecting pin leads to the Power connector female pins when the
> Z-1 plug is removed.
>
> The 1 ohm resistor in the filament line is needed to drop some voltage
> (from fresh batteries) to the tube filament when it is cold-started. Mine
> is made from about 8 feet of 30 gauge magnet wire wound on a high value
> resistor as a form.With my occasional usage the D Cells last "forever".
>
> Tim
>
> N6CC
>
>
> On Wed, Apr 22, 2026 at 3:37 PM KD2GIY via MRCA <mrca at mailman.qth.net>
> wrote:
>
>> On my trip to MD and DE I came across a very good deal on a working
>> prc-25 on the Jeep dock.
>>
>> I understand the radio needs 2 different voltages and it would be a pain
>> in the ass to fabricate this.
>>
>> My question is, does anyone have for sale a drop in battery insert for
>> this radio or can let me know where I can find one on the internet?
>> I've seen pictures of some that take d batteries.
>>
>> I have looked and cannot find anything but used original dead batteries.
>>
>> Thank you for your time.
>>
>> Best regards
>> Dave
>> KD2GIY
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