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Nascar BP120 Compatible Battery 4.8V 1200mAh Ni-MH

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From $28.99 USD $35.99
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Fits Nascar SC140, SC140B, SC150, SC150B radio models; replaces OEM BP120, BP150, BP180, BP250 battery packs.
4.8V 1200mAh Ni-MH chemistry delivers stable voltage across transmission cycles without sag at PTT.
Slide connector interface matches original pack orientation; locking tab seats flush into radio chassis slot.
We bench-tested this cell in SC150B dock—BMS accepted charge on first insertion, voltage held steady under sustained RF load.
On first charge cycle with SC140, insert pack and let the charger dock complete a full green cycle before heavy transmission use.
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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

1200mAh

Nascar SC140 / SC150 Series — 4.8V Ni-MH Replacement Battery (BP120, BP150, BP180, BP250)

This is a 4.8V, 1200mAh Ni-MH replacement battery for Nascar SC140, SC140B, SC150, SC150B, and compatible handheld two-way radios. It replaces OEM part numbers BP120, BP150, BP180, and BP250. Voltage and cell count match the original pack exactly.

  • SC140 and SC150 platform fit: Both the SC140 and SC150 variants share the same 4.8V four-cell Ni-MH architecture, connector pinout, and BMS handshake — so one pack covers the full range without modification.
  • Bench tested on actual hardware: We cycled this pack under simulated PTT load bursts on SC150-series hardware. The BMS handled transmit current spikes without tripping, and the pack held stable voltage through repeated charge-discharge cycles.
  • First insertion into the charger dock: If the dock LED flashes fault on first insertion, remove the pack, wipe the contact strip with a dry cloth, and reseat firmly. The SC-series charger requires a clean contact cycle to initiate the BMS handshake before charging begins.

Why the SC140 cuts out mid-transmission on a freshly inserted pack

Ni-MH cells ship at storage voltage — typically around 1.0–1.1V per cell, giving roughly 4.0–4.4V across a four-cell pack. When PTT is pressed, the transmit current spike can pull pack voltage below the radio's undervoltage cutoff threshold before the cells have had a conditioning charge. The radio interprets this as a depleted pack and drops transmission. A single full charge cycle before first use brings each cell above 1.2V and resolves this entirely.

Bar indicator showing one fewer bar than expected on a new pack

The SC-series radio reads battery level using a simple voltage-threshold indicator — not a fuel gauge chip. A new Ni-MH pack at storage voltage sits below the threshold for a full-bar reading, so the indicator shows one bar low even though the pack is not faulty. Charge the pack fully in the dock until the LED goes green. After one complete charge, resting voltage climbs to approximately 5.6–5.8V and the indicator will reflect the correct level.

Compatible Models

SC140 SC140B SC150 SC150B SC150Y SC180 SC180B SC200

Replaces Part Numbers

BP120 BP150 BP180 BP250

Technical Specifications

Voltage4.8V
Amp Hours1200mAh
Capacity1200mAh
Rate5.76Wh
Net Weight94.7g /3.34 oz
Gross Weight119.7g /4.22 oz
Approximate Weight119.7g /4.22 oz
Dimension 50.51 x 38.80 x 28.60mm

Product Highlights

  • Brand: Nascar
  • 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

My SC140 drops out of transmission halfway through a call — is the new battery causing it?

Yes, and it is a known behaviour with fresh Ni-MH packs at storage voltage. The transmit current spike pulls pack voltage below the radio's cutoff threshold before the cells have been conditioned. Charge the pack fully before first use and the dropout stops.

The charger dock shows a fault LED and never starts charging the new pack — what's wrong?

The SC-series dock needs a clean electrical contact to initiate the BMS handshake. Remove the pack, wipe the gold contact strip with a dry cloth, and reseat it firmly. If the fault LED still shows, check that the pack is fully seated — even a 1mm gap breaks the contact cycle and the dock will not begin charging.

The radio switches to low-power TX output mid-shift even with the new battery — what's happening?

This is voltage sag under sustained RF output, not a faulty cell. Ni-MH cells that have not completed a full conditioning cycle show higher internal impedance, which causes pack voltage to dip under the continuous transmit load. Run two full charge-discharge cycles through the dock, and internal impedance will drop to spec — sustained TX power will stabilise above the radio's sag threshold.

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