Server Batteries & RAID BBU Guide
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Server Batteries — RAID Controller Cache Batteries & BBU Replacement Units
Server batteries — also known as BBU (Battery Backup Units) or RAID cache batteries — protect the write cache on your RAID controller in the event of a sudden power loss. When a RAID controller's BBU fails or reaches end of life, the controller typically disables its write-back cache and falls back to write-through mode, which can significantly reduce I/O performance. Replacing a failed BBU restores full cache performance and data protection.
Resilient Tec stocks replacement BBUs and RAID cache batteries for Dell PowerEdge, HP ProLiant, and Cisco UCS servers — tested and verified compatible before shipment.
How to Tell If Your BBU Needs Replacement
- RAID controller reports "Battery Failed" or "Battery Missing" in iDRAC / iLO / CIMC
- Server logs show write cache disabled due to battery fault
- Significant I/O performance degradation with no other explanation
- BBU charge cycle count exceeds manufacturer threshold (typically 500+ cycles)
- Preventive replacement during scheduled maintenance (BBUs typically last 3–5 years)
Compatibility Note
BBU and RAID battery compatibility is highly specific to the RAID controller model installed in your server — not just the server model itself. For example, a Dell H730 Mini RAID card requires a different battery than an H710 or H730P. Contact us with your server model AND RAID controller part number and we'll confirm the correct replacement.
The Resilient Tec Guarantee
- ✅ All batteries tested for charge capability before shipment
- ✅ Accurate compatibility listings per RAID controller model
- ✅ Warranty included on all batteries
- ✅ Talk to a real engineer for compatibility confirmation