Description
CSB MSJ-400 — 2V 400Ah Long-Life VRLA (AGM) Cell
The MSJ-400 from CSB Battery is a premium 2-Volt, 400Ah (10-hr) valve-regulated lead-acid cell built for mission-critical standby applications. Its long-life plate design and sealed AGM construction deliver dependable performance, fast recovery, and minimal maintenance over a 20-year design life. Ideal for telecom DC plants, UPS strings, utility/switchgear and other stationary power systems.
Key Features
- Long service life: up to ~20 years in float service (25 °C).
- High rate capability: up to 2400A (5 s) for momentary surges.
- Low self-discharge: <10% at 90 days (25 °C); store up to ~6 months.
- Rugged safety: UL 94-V0 flame-retardant ABS case; sealed, spill-proof AGM.
- Service-friendly: I4 copper alloy terminal accepts M8 hardware.
- Size Inches: L 6.57″ W 7.56″ H 13.03″ (Top of Terminal 13.35″)
- Size MM: L 167.2 x 192.2 x 331.25 (Top of Terminal 339.25)
Specifications
| Model | MSJ-400 |
|---|---|
| Nominal Voltage | 2 VDC |
| Capacity | 400Ah @ 10-hr to 1.80 Vpc @ 25 °C |
| Design Life (float) | ≈ 20 years (25 °C) |
| Max Discharge Current | ≈ 2400A (5 seconds) |
| Internal Resistance | ≈ 0.41 mΩ (25 °C) |
| Float Charge | 2.21–2.25 V/cell @ 25 °C |
| Equalize / Cycle | ~2.35 V/cell @ 25 °C |
| Self-Discharge | <10% after 90 days @ 25 °C |
| Terminal | I4 recessed terminal, accepts M8 bolt |
| Container | Flame-retardant ABS, UL 94-V0 |
| Approx. Weight | ~28–29 kg (≈ 61–64 lb) |
Typical Applications
- Telecom & data center DC power plants
- UPS standby strings & long-duration backup
- Utility & switchgear, substation control power
- Renewables, industrial standby, and energy storage banks
What’s Included
- (1) CSB MSJ-400 2V 400Ah VRLA (AGM) cell
- Terminal hardware kit (M8) — when specified
Installation & Notes
- Install in approved racks/cabinets with ventilation; observe polarity.
- Set charger/rectifier to float 2.21–2.25 Vpc at 25 °C; adjust for temperature.
- Torque terminals to manufacturer spec; use insulated busbars/straps.
- For multi-cell strings, match age/state-of-charge and record baseline readings.
CSB-Datasheet-MSJ-400-Specifications 2 Volt 400AH AGM Battery
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