Advanced 7.2V Li-ion replacement battery pack with high capacity for extended run-time. Available in standard 4.7Ah and high-capacity 6.9Ah configurations.
Professional-grade battery replacement engineered for clinical reliability
Matches Smiths/Medex part 22-4050-51 (Unipower B11798) with guaranteed fit and performance
7.2V standard 4.7Ah or upgraded 6.9Ah high-capacity version for extended runtime
Rechargeable Lithium-Ion with ultra-low self-discharge and protective circuit board
Direct replacement design with protective circuit board, plug-compatible with original battery bay
Comprehensive 12-month warranty coverage on battery pack with full support
Standard 4.7Ah provides ~10 hours operation; 6.9Ah upgrade extends runtime by 47%
Designed specifically for Medfusion 4000 Wireless Syringe Pump systems
Advanced lithium-ion technology delivers superior performance and reliability
Standard 4.7Ah configuration provides approximately 10 hours of operation at low flow rates, ensuring reliable power throughout extended procedures.
Upgraded 6.9Ah pack extends runtime by approximately 47%, ideal for long-duration infusions and critical care applications.
Li-ion chemistry rated for ≥400 charge cycles per pump manual specifications, providing years of reliable service in clinical environments.
Ultra-low self-discharge technology maintains charge during storage and standby periods.
Weighs approximately 0.35 kg (0.77 lb), significantly lighter than sealed lead-acid alternatives, helping minimize overall pump weight for improved portability.
Can be recharged whenever connected to AC power. Smart charging circuits prevent over-charge and optimize battery life.
Detailed technical specifications and performance characteristics
| Voltage | 7.2V |
| Capacity (Standard) | 4.7Ah |
| Capacity (High-Capacity) | 6.9Ah |
| Chemistry | Lithium-Ion (18650 cells) |
| Dimensions (Estimated) | ~80×35×30 mm |
| Weight | ~0.35 kg (0.77 lb) |
| Estimated Cycles | ≥400 full cycles |
| Protection | Integrated protective circuit board |
Access technical documentation and product information
Medfusion 4000 Operator's Manual with battery life specifications (~400 cycles)
View ManualOSI Unipower B11798 specification sheet confirms 7.2V, 4.7Ah Li-ion configuration
View SpecsArtisan Power MB-4050-L datasheet for 6.9Ah high-capacity upgrade option
View UpgradeGet your replacement battery or high-capacity upgrade with expert support and fast shipping. Contact our sales team for compatibility questions or large orders.