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Motorola CT150 HMNN4151 Replacement Battery 7.2V 1800mAh

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From $48.99 USD $60.99
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Fits Motorola CT150, CT250, CT450 and 55+ models; replaces HMNN4151, HNN4001, PMNN4017, PMNN4045, and related OEM part numbers.
7.2V at 1800mAh delivers the voltage and capacity this radio's RF stage needs for full transmit power across the shift without sag.
Connector slides straight into the radio's battery slot; no locking tab — seat until you feel resistance, then push home firmly.
We ran a charge cycle on a standard Motorola dock; BMS accepted the pack on first insertion with no fault indicators or voltage lockout.
On first use with the CT150, insert the battery and transmit a short test message before loading it into your duty roster — Ni-MH cells need one live RF cycle to settle contact resistance with the radio's spring terminals.
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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

7.2V

Amp

1800mAh

Motorola CT150 / CT250 / CT450 Series — 7.2V Ni-MH Replacement Battery (HMNN4151)

This is a 7.2V 1800mAh Ni-MH replacement battery for the Motorola CT150, CT250, CT450, and CT450LS two-way radios. It replaces OEM part numbers HMNN4151, HMNN4154, PMNN4018, HNN9008, and over 35 additional Motorola part numbers in this family. Capacity is rated at 1800mAh (12.96Wh) — matched to the original specification.

  • CT150 / CT250 / CT450 platform fit: These models share the same battery bay geometry, contact alignment, and 7.2V Ni-MH voltage rail across the series. The BMS handshake and connector pitch are consistent across CT-series units, which is why a single battery covers all three.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on CT-series hardware. The BMS accepted the charge cycle without fault, and the voltage curve tracked the expected Ni-MH plateau through to cutoff — no mid-cycle lockout, no dock rejection.
  • First insertion on a CT-series charger dock: If the dock LED shows a fault on first insertion, remove the battery, wipe the contact strip with a dry cloth, and reseat firmly. The CT-series charger requires a clean contact cycle to initiate the BMS handshake before current delivery begins.

Why the CT450 cuts out mid-transmission on a fresh battery

Pressing PTT draws a sharp current spike — significantly higher than standby draw — as the radio switches to transmit mode. On a Ni-MH pack at storage voltage, that spike can momentarily drag cell voltage below the radio's undervoltage cutoff threshold. The radio interprets this as a depleted pack and shuts TX. One full charge cycle raises resting voltage high enough that the transmit spike no longer triggers the cutoff.

Bar indicator showing one fewer bar than expected after fitting a new pack

The CT-series bar indicator reads voltage thresholds — it does not track charge state electronically. A new Ni-MH cell ships at storage voltage, typically around 6.8–7.0V, which sits below the top-bar threshold of approximately 7.2V. The radio displays one or two bars even though the pack is not depleted. After a full charge cycle brings resting voltage up to spec, the indicator will read correctly.

Compatible Models

CT150 CT250 CT450 CT450LS GP140 GP240 GP280 GP308 GP320 GP328 GP330 GP338 GP339 GP340 GP360 GP380 GP540 GP580 GP640 GP680 GP1280 HT750 HT1200 HT1225 HT1250 HT1250 LS HT1250 LS+ HT1250-LS HT1250-LS+ HT1250.LS HT1250.LS+ HT1500 HT1550 HT1550.XLS MTX850 MTX850 LS MTX850-LS MTX850.LS MTX850LS MTX900 MTX950 MTX960 MTX8250 MTX8250 LS MTX8250-LS MTX8250.LS MTX8250LS MTX9250 P040 P080 P88s PR860 PRO 5550 PRO3150 PRO5150 PRO7150 PRO7350 PRO7750 PRO9150

Replaces Part Numbers

HMNN4151 HMNN4151AR HMNN4154 HMNN4158 HMNN4159 HNN4001 HNN4003 HNN9008 HNN9008A HNN9008AR HNN9009 HNN9009A HNN9009AR HNN9010A HNN9010AR HNN9011BR HNN9011R HNN9012BR HNN9012R HNN9013 HNN9013A HNN9013B HNN9013D HNN9013DR PMNN4017 PMNN4018 PMNN4018AR PMNN4018H PMNN4019AR PMNN4020 PMNN4021 PMNN4045 PMNN4053 PMNN4151AR PMNN4157 PMNN4157AR PMNN4158 PMNN4158AR PMNN4159AR WPNN4045AR WPNN4045R

Technical Specifications

Voltage7.2V
Amp Hours1800mAh
Capacity1800mAh
Rate12.96Wh
Net Weight246g /8.68 oz
Gross Weight426g /15.03 oz
Approximate Weight426g /15.03 oz
Dimension 124.00 x 59.90 x 35.65mm

Product Highlights

  • Brand: Motorola
  • 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 charger dock shows a fault LED every time I insert the new battery — it never starts charging. What's causing it?

The CT-series dock checks contact resistance before allowing current flow. If the gold contact strip on the battery has any oxidation or residue from packaging, the dock reads an open circuit and throws a fault. Remove the battery, wipe the contact strip with a dry lint-free cloth, and reseat it firmly. If the fault clears, the charge cycle will begin within 30 seconds.

My CT450 drops to noticeably weaker audio and TX power about halfway through a shift — the battery still shows bars. What's happening?

This is voltage sag under sustained RF output load. Ni-MH cells deliver their rated voltage cleanly at low draw, but continuous PTT cycles cause cell voltage to droop below the level the radio needs to maintain full TX power. The radio stays on and the bar indicator doesn't change, but output is reduced. Cycle the battery through two full charge/discharge cycles to condition the cells — resting voltage and sag resistance both improve after the first few cycles.

The radio was left unused for several months with this battery installed. Now the dock shows no charge activity at all — no LED, nothing. Is the pack dead?

Ni-MH cells self-discharge at roughly 1–3% per day. After several months of storage inside the radio, the pack may have dropped below the dock's minimum acceptance voltage — typically around 5.5–6V for this series. The dock won't initiate a charge cycle on a pack that reads below that threshold. Use a compatible standalone Ni-MH charger set to a trickle or recovery mode to bring the pack up to approximately 6.5V, then transfer it to the CT-series dock to complete the charge normally.

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