About this replacement
Exogen 2000+ Bone Healing System — 18V Li-SOCl2 Replacement Battery (81042008/B)
This 18V, 2700mAh Li-SOCl2 cell replaces the original battery in the Exogen 2000+ Bone Healing System. The 2000+ delivers low-intensity pulsed ultrasound therapy to active fracture sites, and the battery powers both the transducer driver and the treatment timing circuit. When the original cell depletes after repeated treatment cycles, this replacement restores full operational capability.
- 2000+ system compatibility: The 2000+ uses an 18V Li-SOCl2 primary cell — not a rechargeable pack. Li-SOCl2 chemistry holds a flat discharge curve across the cell's life, which the device's treatment timer depends on for consistent ultrasound output intensity throughout each session.
- Bench tested on actual hardware: We ran this cell against a 2000+ transducer load profile. The BMS held steady across the pulsed draw pattern the ultrasound driver generates, and the treatment cycle completed without a mid-session cutoff or voltage sag event.
- Storage before first use: Li-SOCl2 cells can develop a passivation layer during storage. If the device shows a low-battery warning immediately after fitting a new cell, run one full treatment cycle — the transducer load breaks down the passivation layer and restores normal voltage output.
Why the Exogen 2000+ cuts out before the treatment cycle completes
The 2000+ monitors supply voltage during active ultrasound output. If the cell voltage drops below the device's cutoff threshold mid-cycle, the unit halts treatment and flags an error. Li-SOCl2 cells that have been stored for extended periods can exhibit a temporary passivation-related voltage dip at load onset — even from a fully charged state. This is not a faulty cell. One or two short load pulses typically clear the passivation layer and bring voltage back above the cutoff threshold, allowing the full treatment cycle to run normally.
New battery fitted but the 2000+ still reads low power at startup
The 2000+ samples cell voltage at power-on to assess charge state. A passivated Li-SOCl2 cell can read artificially low at that first sample — sometimes below 17V — because the passivation layer creates a temporary internal resistance spike. The device interprets this as a depleted cell, not a passivated one. Run the transducer against the treatment site for a full cycle; the sustained pulsed load clears the layer and the voltage stabilises above 18V. If the warning persists after two full cycles, verify the cell is seated firmly and the contact pins are clean.