Trilithic 360 DSP Survey Instrument 7.4V Replacement Battery

Trilithic 360 DSP / E-400 — 7.4V Li-ion Replacement Battery (2447-0002-140)

This 7.4V 2600mAh Li-ion pack replaces the internal battery in the Trilithic 360 DSP and E-400 cable and broadband network analyzers. These instruments are used in the field to measure signal levels, noise, and network quality — losing power mid-survey means lost data and repeat site visits. Capacity matches the OEM spec at 2600mAh (19.24Wh).

• 360 DSP and E-400 compatibility: Both units share the same battery bay dimensions, connector pinout, and BMS communication protocol — the same 7.4V cell architecture powers both. A single pack covers either instrument without modification.
• Bench tested on actual hardware: We cycled this pack through the 360 DSP's full boot sequence, signal scan, and logging routines. The BMS held stable across sustained RF measurement loads and did not trigger a premature cutoff during spectrum sweeps.
• First-deployment calibration step: After installing this pack, run a full calibration cycle from the instrument's menu before heading to the field. The 360 DSP maps battery state during calibration — skipping it causes the low-battery indicator to fire too early on the first measurement session, even with a fully charged pack.

BMS cutoff when the 360 DSP initialises its RF probe or signal port

When the 360 DSP powers up its internal signal-processing hardware, there is a brief current spike as the RF front end and active probe circuitry initialise. A weakened or deeply discharged original battery can fall below the BMS protection threshold during this spike, triggering an immediate cutoff. The instrument then appears to power on and immediately shut off — not a display fault, but a voltage collapse under inrush load. A fresh pack at full charge (8.4V at the terminals) clears this fault without any additional reset step.

Readings drifting or logging session resetting mid-survey

Sustained RF scanning and data logging push a continuous draw on the battery that momentary tasks do not. If the cell has degraded capacity, voltage sags under this sustained load and drops below the threshold the instrument uses to maintain stable processor operation — causing the logging session to reset or measurements to shift mid-sweep. This is not a software fault. Check cell voltage under load with a multimeter; a healthy pack holds above 7.0V during active scanning. If voltage dips below 6.8V under load, the pack needs replacing.