Diquea EP8100 Compatible Battery 7.4V 2400mAh Li-ion

Diquea EP8100 / EP8000 — 7.4V Li-ion Replacement Battery

This 7.4V, 2400mAh lithium-ion battery replaces the original pack in the Diquea EP8100 and EP8000 portable two-way radios. It uses the same cell configuration and BMS voltage thresholds as the factory pack. Capacity is 2400mAh (17.76Wh) as specified by the product data.

• EP8100 and EP8000 platform: Both models run the same 7.4V dual-cell architecture with identical connector pinout and BMS handshake protocol, which is why one pack covers both. Swapping between them requires no modification.
• Bench tested on actual hardware: We cycled this pack through repeated PTT transmit events to confirm the BMS handles the current spike at key-up without tripping into overcurrent lockout. Cell voltage held within spec across the full discharge curve.
• First insertion contact check: If the charger dock shows a fault LED on first insertion, remove the pack, wipe the contact strip with a dry cloth, and reseat firmly. The EP8100 dock requires a clean contact cycle to recognise the new BMS handshake before it will begin charging.

Why the EP8100 cuts out mid-transmission on a new battery

New cells ship at storage voltage — typically around 3.7V per cell, or 7.4V combined — not at full charge. When PTT is pressed, transmit current spikes sharply. If the pack hasn't been fully charged first, the cells sag under that load and the BMS interprets the voltage drop as an unsafe discharge event, cutting the radio mid-transmission. A full charge cycle before first use brings both cells to 4.2V each, giving the BMS enough headroom to absorb the transmit spike without triggering a cutoff.

Bar indicator showing one fewer bar than expected after installation

The EP8100 uses a voltage-threshold bar indicator — each bar corresponds to a voltage band, not a fuel gauge reading. A new pack at storage voltage sits at the lower threshold of the indicator scale, so the radio displays one or even two bars fewer than a fully charged pack. This is not a fault with the battery. Charge the pack fully in the dock until the indicator goes solid green, then reinsert into the radio — the bar display will reflect the correct charge level at or above 8.2V combined cell voltage.