EBP-80 Alinco DJ-CH20 Replacement Battery 3.7V 1200mAh

Alinco DJ-CH20 / DJ-CH27 Series — 3.7V Li-ion Replacement Battery (EBP-80 / EBP-90)

This is a 3.7V, 1200mAh Li-ion battery pack for the Alinco DJ-CH20, DJ-CH20B, DJ-CH20S, DJ-CH27, and compatible variants. It replaces OEM part numbers EBP-80 and EBP-90. The pack slots into the same bay as the original and the BMS communicates with the radio's charge circuit directly.

• DJ-CH20 and DJ-CH27 series compatibility: These models share the same battery bay geometry, contact layout, and 3.7V nominal voltage rail. One pack covers the full range because the BMS handshake protocol and connector pinout are identical across the series.
• Bench tested on actual hardware: We cycled this pack through transmit loads on the DJ-CH20 platform. The BMS held the voltage rail stable under PTT spikes and tripped correctly at the low-voltage cutoff threshold without locking the pack out.
• First insertion into the charger dock: If the dock LED blinks or shows a fault on the first seating, remove the pack and wipe the gold contact strip with a dry cloth before reinserting. The Alinco dock runs a contact-continuity check before accepting a new BMS for the initial charge cycle.

Why the DJ-CH20 cuts out mid-transmission on a freshly installed EBP-80

New Li-ion cells ship at storage voltage — typically 3.6V to 3.65V — not at full charge. When PTT is pressed, transmit current spikes sharply and the BMS sees the voltage rail dip below its cutoff threshold before the cell has been conditioned. The radio interprets this as a depleted pack and shuts the TX stage. A full charge cycle before first use brings the cell to 4.2V and gives the BMS enough headroom to handle the transmit surge cleanly.

Bar indicator showing one fewer bar than expected after fitting a new EBP-90

The DJ-CH20 reads bars from fixed voltage thresholds, not a fuel gauge chip. A new cell at storage voltage sits at approximately 3.6V, which maps to one or two bars on the radio's voltage ladder. This is not a fault with the pack. Charge the battery fully in the dock until the LED goes solid green, then reinsert — the indicator will reflect the correct 4.2V resting voltage and display the expected full-bar reading.