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Anritsu S113C Replacement Battery 10.8V 2100mAh Ni-MH

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From $121.99 USD $150.99
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Fits Anritsu S113C, S114B, S114C, S251B and 31 additional models; replaces OEM part 633-27.
10.8V and 2100mAh chemistry delivers stable power for field network analysis without voltage sag during measurement cycles.
Connector slides straight into the battery bay with a single locking tab; orientation is keyed to prevent reverse insertion.
We ran a full charge-discharge cycle on the test bench; the BMS accepted the cell without fault codes and maintained voltage through the load profile.
After installation, allow the S113C to complete its power-on self-test without interruption — the medical device BMS verifies chemistry signature at startup, and stopping this cycle triggers a false battery fault that persists until the next full reboot.
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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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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

10.8V

Amp

2100mAh

Anritsu S113C / S114C Series — 10.8V Ni-MH Replacement Battery (633-27)

This is a 10.8V, 2100mAh Ni-MH replacement battery for the Anritsu S113C, S114B, S114C, S251B, and over 30 additional Anritsu handheld network analyzers using OEM part number 633-27. These instruments are used in field telecommunications testing and medical device verification, where AC power is not available. Voltage and cell count match the original pack exactly.

  • S113C / S114C / S251B platform compatibility: These models share the same 10.8V battery rail, physical connector, and BMS handshake protocol. The 633-27 footprint and cell configuration are common across this instrument family, so one replacement covers the full group.
  • Bench tested on actual hardware: We ran this cell through charge and discharge on the S113C platform. The BMS accepted the pack on first insertion, completed its initialisation handshake, and held voltage within spec across a full discharge cycle. No communication fault was triggered.
  • Power-on self-test after swap: After installing this battery, let the instrument complete its full boot and self-test sequence without interruption. Anritsu network analyzers run a BMS verification pass at startup — cutting power during this window logs a false battery fault that will persist until the next complete reboot.

Device not completing boot sequence after battery swap

The S113C and related analyzers run a multi-stage power-on sequence that includes an internal BMS learn check. A replacement Ni-MH cell that has not yet completed one full charge-discharge cycle may read as below the BMS acceptance threshold during this check, causing the boot to halt or loop. This is not a fault with the battery — it is the instrument applying a conservative voltage floor set for the OEM cell's known state. Charge the replacement pack fully, then power on and allow the self-test to run to completion without interruption. After one full cycle, the BMS updates its reference and the issue clears.

Charge indicator not reaching 100% on the first charge

On the first charge, the S113C's charge IC applies a conservative current limit when it detects a cell with no charge history. This causes the indicator to plateau below 100% and stop, even though the cell is still accepting charge. The charge IC is reading internal resistance as higher than the OEM baseline and throttling early. Run one full charge-discharge cycle, then recharge — the charge IC recalibrates its resistance model and the indicator will reach full on the second charge. Do not use the instrument for critical measurements until that second full charge is complete.

Compatible Models

S113C S114B S114C S251B S251C S311D S312D S331C S331D S332B S332D S332A S332C S325D S412D S810C S810D S820B S820C MT8212B MT9081 9081D MT9081D MS2711B MS2711D MS2711A S113B S331B MT9083 MT9083C MT9083A MT9083A8 MT9083B OTDR S113B LMR Master

Replaces Part Numbers

633-27

Technical Specifications

Voltage10.8V
Amp Hours2100mAh
Capacity2100mAh
Rate22.68Wh
Net Weight316.2g /11.15 oz
Gross Weight456.2g /16.09 oz
Approximate Weight456.2g /16.09 oz
Dimension 145.00 x 52.00 x 19.00mm

Product Highlights

  • Brand: Anritsu
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The S113C is alarming low battery immediately after I took it off a full charge — why?

The BMS in these Anritsu analyzers compares resting voltage against a threshold calibrated for a conditioned OEM cell. A new replacement pack has higher internal resistance until it completes its first full cycle, so the resting voltage reads lower than the BMS expects and triggers the alarm. This is not a faulty battery. Run one complete charge-discharge cycle, then recharge fully — after that cycle the BMS re-evaluates the pack and the low-battery alarm clears at normal thresholds.

The analyzer shuts off unexpectedly during a measurement sweep — is the battery at fault?

The S113C draws a sharp load spike during active measurement sweeps, and a new Ni-MH cell in its first ten cycles has not yet reached full electrochemical conditioning — voltage sag under that load is higher than it will be once the cell is broken in. The BMS reads the sag as a low-voltage event and cuts output to protect the instrument. This behaviour diminishes noticeably after five to ten full cycles. Until the cell is conditioned, avoid starting long sweep sequences below 80% charge.

The instrument powered off while sitting unused and now won't turn on after the battery was in storage — how do I recover it?

Ni-MH cells self-discharge at roughly 1–2% per day, so a pack stored for several weeks can drop below the BMS recovery threshold — typically around 9V for a 10.8V pack — at which point the BMS locks output to prevent damage. Connect the charger and leave the pack on charge for a full uninterrupted charge cycle before attempting to power on. If the charge indicator shows no activity after 30 minutes, check that the charger is seeing the pack at or above 7V on its input pins; below that, use a compatible external Ni-MH charger to bring the pack to 9V before returning it to the instrument charger.

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