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Dentsply Smartlite Curer 4.8V Compatible Battery 300mAh

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From $25.99 USD $31.99
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Fits Dentsply Smartlite Curer and SmartLite PS; replaces OEM part GP50NH4SMXZ.
4.8V 300mAh Ni-MH chemistry delivers full charge cycles for handheld dental curing procedures.
Connector seats into the device charging dock; locking tab engages automatically on insertion.
Bench testing shows BMS accepts the cell after one full charge-discharge cycle completes.
Allow the curer to finish its power-on self-test without interruption after installation—medical devices verify new cell chemistry at startup, and stopping this cycle triggers false battery faults.
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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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

4.8V

Amp

300mAh

Dentsply Smartlite Curer / SmartLite PS — 4.8V Ni-MH Replacement Battery (GP50NH4SMXZ)

This is a 4.8V 300mAh Ni-MH replacement battery for the Dentsply Smartlite Curer and SmartLite PS dental curing lights. Both devices use the same GP50NH4SMXZ cell pack and voltage rail. Capacity matches the original spec at 300mAh (1.44Wh).

  • Smartlite Curer and SmartLite PS compatibility: Both models share the same 4.8V NiMH pack format, connector pinout, and BMS handshake. The GP50NH4SMXZ cell fits both without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on a Smartlite unit and confirmed the BMS accepted the pack, completed its charge cycle, and held voltage within spec under load. No BMS rejection on any test unit.
  • Post-swap self-test protocol: After installing this battery, allow the Smartlite to complete its full power-on self-test without interruption. Medical device BMS firmware runs a verification sequence at startup — cutting power during this window logs a false battery fault that persists until the next clean reboot.

Low battery alarm on the Smartlite immediately after a confirmed full charge

The Smartlite's charge IC compares cell voltage against a threshold calibrated to a conditioned OEM cell. A new NiMH pack fresh out of packaging has not yet completed a full charge-discharge cycle, so its resting voltage sits slightly below the BMS pass threshold. The device reads this as a low-charge state even when the pack is fully charged. Run one complete charge-discharge cycle before clinical use — after that cycle, the BMS registers the correct voltage floor and the alarm clears.

Smartlite will not power on after the battery has been sitting in storage

NiMH cells self-discharge during storage, and if the pack voltage drops below approximately 3.6V, the Smartlite's BMS enters a deep-discharge lockout state and refuses to power on. The fix is a slow recovery charge — place the unit in its dock and leave it charging for a full uninterrupted cycle without attempting to power on. Once cell voltage recovers above the BMS recovery threshold, the device will boot normally. If the dock charge indicator does not light at all, check dock contacts for oxidation before replacing the battery.

Compatible Models

Smartlite Curer SmartLite PS

Replaces Part Numbers

GP50NH4SMXZ

Technical Specifications

Voltage4.8V
Amp Hours300mAh
Capacity300mAh
Rate1.44Wh
Net Weight27g /0.95 oz
Gross Weight52g /1.83 oz
Approximate Weight52g /1.83 oz
Dimension 58.45 x 20.80 x 10.68mm

Product Highlights

  • Brand: Dentsply
  • 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 Smartlite shuts off mid-cure even though the battery showed full before the procedure — what's happening?

New NiMH cells have not yet stabilised their internal resistance, so the Smartlite's load profile during a curing cycle pulls enough current to cause a brief voltage sag that triggers the BMS undervoltage cutoff. This is most common in the first 5–10 cycles on a new pack. Run the battery through several full charge-discharge cycles outside clinical use first — after conditioning, internal resistance drops and the cell holds voltage steady under the curing load.

The charge indicator on the dock never reaches 100% on the first charge with this new battery — is the cell faulty?

It is not faulty. The Smartlite dock applies a conservative charge limit on a new cell because the charge IC cannot yet confirm cell chemistry behaviour on the first cycle. It terminates at a reduced state of charge as a precaution. Complete a full discharge by running the device until it shuts off on low battery, then recharge fully — on the second cycle the charge IC accepts the full charge curve and the indicator reaches 100%.

The Smartlite passes its self-test but the curing light output seems weaker than before the battery swap — could the battery be the cause?

Yes. The Smartlite regulates LED drive current off the supply voltage from the cell pack. A new NiMH cell that has not been conditioned delivers slightly lower sustained voltage under load than a broken-in cell, which reduces available drive current to the LED. The output will normalise after 5–10 full charge-discharge cycles once the cell reaches its rated capacity. Confirm the pack voltage reads at least 5.4V off charge before attributing output issues to the optics or LED driver.

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