51.2V 51.2Ah 26650 Battery Pack with IP67 Metal Housing for Outdoor Backup Power
In early February 2026, a backup-power system integrator supplying telecom and off-grid infrastructure sites came to CM Batteries after a run of field failures tied to weather exposure. Units installed at exposed outdoor sites were experiencing moisture ingress after storm season, and site operators had no remote way to confirm whether a unit was healthy without physically visiting the location. The customer needed a fully weatherproof battery pack that could also report its status back to a central monitoring system.
CM Batteries built a 51.2V 51.2Ah 16S16P LiFePO4 battery pack in an IP67 metal housing with RS485 communication, validated for -30°C to 60°C operation — giving the customer a weatherproof battery pack that plugs directly into their existing remote monitoring platform. It’s one of the higher-capacity builds in CM Batteries’ custom 26650 battery pack lineup for exposed outdoor installations.
Outdoor Backup Power Customer Overview
The customer integrates backup-power systems for telecom base stations and off-grid infrastructure sites, many of which sit fully exposed to rain, dust, and seasonal temperature swings with no on-site enclosure of their own.
Because these sites are spread across a wide geographic footprint, the operations team relies on remote diagnostics rather than routine site visits — making both weatherproofing and communication protocol support non-negotiable requirements for any new battery platform.
51.2V 51.2Ah 16S16P Low Temperature Battery Pack Design
Product Highlights
- Nominal voltage: 51.2V
- Capacity: 51.2Ah
- Configuration: 16S16P, 256 cells
- Operating temperature: -30°C to 60°C
- Enclosure protection: IP67-rated metal housing
- Communication: RS485 protocol
- Certification: ISO 9001-manufactured; UL / CE / IEC 62133 available upon request
- Custom options:Communication protocol, voltage platform, and enclosure mounting
| No. | Item | Parameter | Remark |
|---|---|---|---|
| 1 | Nominal Voltage | 51.2V | 3.2V/Cell |
| 2 | Nominal Capacity | 51.2Ah | @ 0.2C |
| 3 | Minimum Capacity | 50Ah | |
| 4 | Shipment Voltage | / | |
| 5 | Initial Internal Impedance | ≤325mΩ | AC 1KHz |
| 6 | Standard Charge Voltage | 58.4V | 3.65V/Cell |
| 7 | Standard Charge Current | 10.24A | |
| 8 | Max. Charge Current | 25.6A | |
| 9 | Standard Discharge Current | 10.24A | |
| 10 | Max. Discharge Current | 153.6A | |
| 11 | Burst Discharge Current | 307.2A | ≤5s |
| 12 | Discharge Cut-off Voltage | 40V | 2.5V/Cell |
| 13 | Cycle Life | ≥1500 cycles | Retention ≥80% |
| 14 | Charge Temperature | -30°C ~ +60°C | Standard Charge |
| 15 | Discharge Temperature | -30°C ~ +60°C | Standard Discharge |
| 16 | Storage Temperature | -20°C ~ +35°C | ≤3 months |
| -20°C ~ +25°C | ≤1 year | ||
| 17 | Weight | About 25 | Kg |
| 18 | Special Technical Requirements | Smart BMS + RS485 + IP67 |
51.2V 51.2Ah IP67 Battery Pack FAQs
Should I choose IP67 or IP68 for my outdoor equipment?
IP67 is typically sufficient for equipment exposed to rain and dust but not submerged. If your equipment needs to operate continuously underwater — such as an ROV or subsea sensor — an IP68-rated battery pack is the better fit. See CMB’s waterproof battery pack page for the full comparison.
What monitoring systems can RS485 connect to?
RS485 is a widely used industrial communication standard, typically compatible with monitoring platforms that support Modbus and similar protocols. Compatibility with your specific system is confirmed during project scoping.
How long can 51.2Ah battery pack support my backup load?
Runtime depends on your equipment’s power draw. Share your load profile with CMB’s team and we’ll help size the right capacity for your required backup window.
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