About this replacement
Alinco DJ-S41 / PMR446 / DJ-SR1 — 3.6V Ni-MH Replacement Battery (EBP-25N)
This is a 3.6V 700mAh Ni-MH replacement for the Alinco EBP-25N battery pack. It fits the DJ-S41, PMR446, and DJ-SR1 handheld transceivers. Slot it into the existing battery bay — the housing matches the OEM footprint at 45.25 × 31.29 × 11.00mm.
- DJ-S41 / PMR446 / DJ-SR1 platform fit: All three models share the same 3.6V battery bay, connector pinout, and contact strip layout. One pack covers the entire group without adapters or modifications.
- Bench tested on actual hardware: We cycled this pack through transmit and receive loads on the DJ-S41. The BMS handled the PTT current spike cleanly and did not trip on a standard voice transmission burst.
- First charge on Ni-MH after swap: Ni-MH cells ship at partial charge — do not treat a low bar reading as a fault. Place the pack in the Alinco dock immediately after installation and run a full charge cycle before the first transmission. The dock needs a complete charge pass to calibrate its termination cutoff to the new cells.
Why the DJ-S41 cuts out mid-transmission on a freshly inserted EBP-25N
Ni-MH cells at storage voltage sit around 1.1–1.15V per cell. Under PTT load, that drops fast enough for the radio's low-voltage cutoff circuit to interrupt TX before the transmission ends. This is not a faulty pack — it is an under-charged pack. A full dock charge brings each cell to roughly 1.4V at termination, which gives the voltage headroom the radio needs to sustain transmit current without dropping out.
Bar indicator stuck on one bar after fitting a new EBP-25N
The DJ-S41 reads battery level by sampling terminal voltage against fixed thresholds. A new Ni-MH pack at storage charge sits below the threshold for the second bar, so the indicator shows one bar even though the cell is not depleted. This is a voltage state issue, not a capacity issue. Put the pack on charge in the Alinco dock until the charge LED goes green, then power the radio on — the bar indicator should move to full at or above 3.6V resting voltage.