[MRCA] Prc-25 battery question

[Tim]

The battery manufacturer might want to reconsider their name: GTL
EvreFire....?
HiHi
Tim
N6CC

On Thu, Apr 23, 2026 at 8:22 AM Glenn Little WB4UIV via MRCA <
mrca at mailman.qth.net> wrote:

> The batteries in the photo are questionable.
> The best 18650 cells are 3500 mAh.
> If you measure their true capacity, I would be very surprised if the
> capacity was 2200 mAh.
> There should be a battery maintenance board in the battery pack that
> limits the charge/discharge rate and shuts down the pack on low Voltage.
> With out the BMS there is an increased possibility of fire.
>
> 73
> Glenn
> WB4UIV
>
>
> On 4/22/2026 11:31 PM, Clare Owens via MRCA wrote:
>
> 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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>
>
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> --
> -----------------------------------------------------------------------
> Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
> Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
> QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
> "It is not the class of license that the Amateur holds but the class
> of the Amateur that holds the license"
>
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