IBM AS400 RAID Controller Replacement Battery 3.6V 44L0305
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IBM AS400 RAID Controller Replacement Battery 3.6V 44L0305 - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
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Delivery and Shipping
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
IBM AS400 RAID Controller Replacement Battery 3.6V 44L0305 - is backordered and will ship as soon as it is back in stock.
Voltage
3.6V
Amp
800mAh
IBM AS400 / ServeRAID 3H — 3.6V Ni-MH Replacement Battery (44L0305)
This 3.6V, 800mAh Ni-MH cell replaces the cache backup battery on IBM AS400 and AS400 i5 RAID controllers, including ServeRAID 3H and compatible units. It holds the controller's write cache during a power loss event, preventing data corruption in the RAID array. Voltage and capacity match the OEM specification: 3.6V, 800mAh (2.88Wh).
- AS400 and ServeRAID 3H compatibility: These controllers share the same 3.6V Ni-MH cell format, connector pinout, and BMS handshake threshold. The same cell services the AS400 i5 and the 63H0935 board variant because they all draw from an identical voltage rail with the same charge termination logic.
- Bench tested on actual hardware: We cycled this cell through charge, full-load discharge, and BMS communication checks on a ServeRAID 3H controller. The BMS accepted the cell without error flags and completed charge termination at the correct delta-V cutoff for Ni-MH chemistry.
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Post-swap learn cycle on the AS400 controller:
After fitting this cell, trigger the battery learn cycle from the controller management interface — StorCLI:
storCLI /cx bbu show. The controller holds write-through mode until the learn cycle recalibrates the backup window estimate against the new cell's actual capacity. Skipping this step means write-back mode never re-engages.
Why the AS400 RAID controller stays in write-through mode after a battery swap
The controller does not automatically switch back to write-back mode when a new cell is installed. It enters write-back only after the learn cycle completes and the BMS has calculated a new backup window from a full charge-discharge run on the replacement cell. Until that cycle finishes — which can take 24 to 72 hours under normal load — the controller treats the battery as unverified and keeps write-through mode active. Manually initiating the learn cycle from the management interface shortens this window rather than waiting for the scheduled automatic cycle.
Management console still showing a battery error days after installation
The AS400 controller's battery self-assessment does not run at boot — it runs on a timed interval set in firmware, typically 24 to 90 days depending on configuration. If the console flags a battery error shortly after a swap, the assessment was already scheduled before the swap occurred. The new cell must complete at least one full learn cycle before the controller logs a clean battery status. Run storCLI /cx bbu show to confirm learn cycle progress; the error clears once the cycle completes and the backup window reads above 0 seconds.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: IBM
- Manufacturer: CS
- Series: Standard
- Color: Green
- Product Type: Ni-MH
- Battery Type: Ni-MH
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The controller came back online after the battery swap but it's still running in write-through mode — what's holding it back?
Write-back mode won't re-engage until the controller finishes a battery learn cycle on the new cell. The BMS needs to run a full charge-discharge pass to calculate a verified backup window before it trusts the replacement cell. Initiate the cycle manually with `storCLI /cx bbu show` to check status, then trigger the learn if it hasn't started. Write-back re-engages automatically once the backup window registers above zero.
The backup window on the new battery is showing shorter than the original — is the cell faulty?
Not necessarily. The controller's backup window estimate is based on the previous cell's calibration data, which doesn't carry over to a new cell. The first learn cycle on a fresh Ni-MH cell often underestimates capacity because the cell hasn't been conditioned yet. Run two to three full learn cycles and the backup window recalculates against the cell's actual charge-hold characteristics — the figure typically rises to the expected range by the third cycle.
The battery self-test failed in the management console three weeks after the swap — the cell looked fine at install, what changed?
Nothing changed — the self-test that flagged the failure was likely scheduled before the swap and ran against a cell that hadn't yet completed its first learn cycle. Ni-MH cells require a completed charge-discharge calibration pass before the BMS can confirm a valid backup window. Check the cycle status with `storCLI /cx bbu show`; if the learn cycle is still pending or was interrupted, restart it. The self-test result clears once the cycle finishes and the controller logs a confirmed backup window at 3.6V full charge.
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