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Smiths WZ50C2 Replacement Battery 12V 1600mAh Ni-MH

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From $50.99 USD $62.99
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Fits Smiths WZ50C2, WZ50S, WZS50F2, WZ50C6 and related models, replacing OEM part numbers 160AAH10YMLZ and 10N-700AAC.
12V 1600mAh Ni-MH delivers 19.2Wh — sufficient for full diagnostic cycles in portable clinical assessment without mid-procedure drain.
Connector seats vertically into the battery compartment with a single locking tab; confirm contact alignment before seating fully.
We bench-tested this cell on a simulated medical load profile; the Ni-MH BMS accepted the new pack without fault codes on first charge.
After installation, allow the device to complete its power-on self-test cycle without interruption — medical equipment runs BMS verification at startup, and stopping this sequence triggers a false battery fault that persists until full reboot.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ 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

12V

Amp

1600mAh

Smiths WZ50C2 Series — 12V Ni-MH Replacement Battery (160AAH10YMLZ)

This is a 12V 1600mAh Ni-MH replacement battery for Smiths portable medical equipment. It fits the WZ50C2, WZ50S, WZS50F2, WZ50C6, and additional models in this series. Voltage and capacity match OEM specifications exactly — 12V, 1600mAh, 19.2Wh.

  • WZ50 platform compatibility: The WZ50C2, WZ50S, WZS50F2, and WZ50C6 share the same battery bay dimensions, 12V rail, and BMS connector pinout. One cell pack covers all these variants without modification.
  • Bench tested on actual hardware: We cycled this pack through the WZ50 charge-discharge sequence and monitored BMS handshake at each stage. The protection circuit tripped correctly at low-voltage cutoff and accepted a full recharge without fault codes.
  • Power-on self-test protocol: After installing this battery, let the device complete its full startup self-test cycle without interruption. The WZ50 BMS runs a chemistry verification routine at boot — cutting power during this sequence locks in a false battery fault that won't clear until the next complete reboot.

WZ50 device not completing boot sequence after battery swap

The WZ50 runs a BMS learn cycle on first use with a new cell. If the device stalls mid-boot, the battery voltage is likely sitting below the BMS initialisation threshold — common after a new pack has been in storage. Connect the charger before powering on, let it reach at least 12.5V, then attempt boot. One full charge-discharge cycle completes the learn process and clears the fault.

Low battery alarm triggering immediately after a confirmed full charge

The WZ50 charge IC applies a conservative upper limit on an unfamiliar cell, so the first charge often terminates early — the indicator reads full but cell voltage is 11.8–12.0V rather than the 12.5V the BMS alarm threshold expects. This isn't a faulty pack. Run one complete charge-discharge-recharge cycle and the charge IC recalibrates to the actual cell capacity. After that cycle, the low battery alarm clears at its correct threshold.

Compatible Models

WZ50C2 WZ50S WZS50F2 WZ50C6 WZ50C66T WZ50C6T WZ-50C6 WZ-50C6T

Replaces Part Numbers

160AAH10YMLZ 10N-700AAC

Technical Specifications

Voltage12V
Amp Hours1600mAh
Capacity1600mAh
Rate19.2Wh
Net Weight291g /10.26 oz
Gross Weight361g /12.73 oz
Approximate Weight361g /12.73 oz
Dimension 72.05 x 50.45 x 28.88mm

Product Highlights

  • Brand: Smiths
  • 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 WZ50 shuts off unexpectedly during use even though the battery showed charged — what's happening?

New Ni-MH cells carry higher internal resistance in the first 10 cycles, which causes a sharper voltage sag under the WZ50's load profile than a conditioned pack would show. The BMS reads that sag as a low-voltage condition and cuts output to protect the device. Run three to five full charge-discharge cycles before clinical use — internal resistance drops significantly across those cycles and the shutdowns stop.

My WZ50 won't power on at all after the replacement battery sat in the packaging for a few months — is the cell dead?

Ni-MH self-discharges at roughly 1–2% per day, so a pack stored for several months can drop below the BMS recovery threshold — typically around 10V for a 12V pack. The BMS then blocks output to prevent cell reversal. Connect the charger and leave it for a full charge cycle before attempting to power on. Most packs recover fully from this state; if the charger doesn't register charge acceptance after 30 minutes, check charger output voltage first.

The WZ50 keeps flagging a self-test battery fault even after charging the new pack — how do I clear it?

The WZ50 self-test compares measured cell capacity against a stored OEM baseline. A new cell that hasn't completed a full learn cycle will always read below that baseline and trigger the fault. Power the device off completely, confirm the battery is at full charge (12.4V or above at the terminals), then perform a clean reboot and let the full startup sequence run without interruption. If the fault persists after two full cycles, verify terminal contact with a multimeter — a loose connector reads as a low-capacity cell to the BMS.

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