Williams Sound BAT-100 DLT100 Replacement Battery 3.7V 1350mAh

Williams Sound DLT 100 / DLT 300 — 3.7V Li-Polymer Replacement Battery (BAT-100)

This is a 3.7V, 1350mAh Li-Polymer replacement battery for the Williams Sound Digi-Wave DLT 100 and DLT 300 transceiver series, including the DLT 100 2.0. It replaces OEM part numbers BAT-100 and BAT-100-KT-SVC. The cell fits directly into the original battery compartment and connects to the same BMS interface as the factory unit.

• DLT 100 and DLT 300 platform fit: Both transceiver generations share the same 3.7V battery bay, connector pinout, and BMS communication protocol — which is why a single cell covers the full DLT line, including the DLT 100 2.0 revision.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge runs on the DLT 100 platform. The BMS held within the expected cutoff thresholds, and the protection circuit tripped cleanly at the low-voltage limit without latching.
• First-cycle current draw on the DLT 100: Run the amplifier at 50% volume through the entire first charge cycle. Full-volume operation during an uncalibrated first cycle draws peak current before the cell has established its rated delivery capacity, which can cause the BMS to trip early and underreport usable charge.

Amp shutting off before the battery indicator reaches empty on the DLT 100

The DLT 100 amplifier needs a minimum supply voltage to sustain its audio output stage — typically above the voltage at which the battery indicator visually hits zero. If the cell voltage sags under load before the display registers empty, the amp's internal protection will cut power first. A new Li-Polymer cell fresh out of a storage state can show this behaviour on the first one or two cycles before the BMS calibrates to actual capacity. Run two full charge-discharge cycles at moderate volume and check whether the cutoff point shifts. If the amp is still shutting off early, confirm the resting voltage after a full charge reads at or above 4.1V.

Audio clipping on the DLT 100 at moderate gain with a partially discharged battery

Clipping on a portable amplifier is not always a gain setting problem — it can be a voltage sag issue. As the Li-Polymer cell discharges toward the lower end of its range, the voltage available to the output stage drops, and the amp clips audio peaks it could handle cleanly at full charge. On the DLT 100, this tends to show up around the 40–50% discharge mark when gain is set above the midpoint. If clipping appears at moderate volume with a partially charged battery, recharge the cell and retest. If clipping persists on a fully charged cell, check that resting voltage is reaching 4.1V — a cell that tops out at 3.9V is not fully charging.