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Motorola HMNN4151 CT150 Replacement Battery 7.2V 2100mAh

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New arrival
From $50.99 USD $62.99
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Fits Motorola CT150, CT250, CT450 and 55+ models; replaces HMNN4151, HNN4001, PMNN4017, PMNN4018, PMNN4045, and similar OEM part numbers.
7.2V, 2100mAh nickel-metal hydride pack delivers steady voltage under sustained transmit load without the voltage sag that cuts TX power mid-shift.
Connector slides straight in with vertical orientation; locking tab seats flush against the radio frame — no forcing required on insertion or removal.
We bench-tested this cell on a CT250 charger dock; BMS accepted the pack on first insertion and held green charge indicator through the full cycle.
On first use with the CT150, the charger dock may show a fault blink if contacts haven't seen a cell in storage — remove the battery, wipe the gold contact strip on the pack with a dry cloth, and reseat firmly to clear the dock handshake.
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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

2100mAh

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

This is a 7.2V, 2100mAh nickel-metal hydride battery for the Motorola CT150, CT250, CT450, and CT450LS portable two-way radios. It replaces a wide range of OEM part numbers including HMNN4151, HMNN4151AR, PMNN4017, PMNN4018, and HNN9008 variants. Drop the old pack out, seat this one in, and the radio powers on without configuration changes.

  • CT150 / CT250 / CT450 platform fit: These models share the same battery bay geometry, contact pin layout, and 7.2V NiMH voltage rail. The BMS handshake across all variants uses the same threshold, so one pack covers the full range without adapter or modification.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the CT series dock. The BMS held the 7.2V rail steady under simulated transmit load and did not trigger a protection cutoff at normal PTT current draw.
  • First-charge protocol on the CT dock: NiMH cells ship at a partial storage charge. Run the first full charge cycle in the Motorola dock without interruption — pulling the pack early on the first cycle can cause the dock to misread cell capacity on subsequent charges and display a premature full-charge LED.

Why the CT450 cuts out mid-transmission on a new HMNN4151 pack

NiMH cells fresh from storage sit between 1.0V and 1.1V per cell — below the voltage the radio expects under transmit load. When you key PTT, the radio draws a sharp current spike to drive the RF stage. If cell voltage sags below roughly 6.0V under that load, the radio's undervoltage protection trips and kills the transmission. This is not a fault with the pack. One or two full charge-discharge cycles on the Motorola dock brings the cells up to working voltage and the sag disappears.

CT150 bar indicator showing one bar on a fully charged new pack

The CT series reads voltage thresholds at rest to set the bar display — it does not track capacity directly. A new NiMH pack at storage voltage reads lower than a conditioned pack at the same state of charge, so the radio displays fewer bars even after the dock shows a full-charge LED. Complete one full discharge-charge cycle through the dock. Resting voltage after that cycle should sit above 7.5V, and the bar indicator will reflect that 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 Hours2100mAh
Capacity2100mAh
Rate15.12Wh
Net Weight267g /9.42 oz
Gross Weight447g /15.77 oz
Approximate Weight447g /15.77 oz
Dimension 124.00 x 59.90 x 34.90mm

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

My CT450 cuts out every time I hold PTT for more than a few seconds — is the new battery causing this?

Yes, and it is a voltage issue, not a defective pack. NiMH cells at storage charge sag hard under the transmit current spike, dropping below the radio's undervoltage cutoff and killing the transmission. Fully charge the pack in the Motorola dock without interruption, then run it through one complete discharge cycle. After conditioning, resting voltage should hold above 7.5V and the mid-transmission dropout stops.

The charger dock blinks a fault LED every time I insert the new HMNN4151 — what does that mean?

The dock is rejecting the pack because the cell voltage is below the dock's acceptance threshold — this happens when NiMH cells arrive at deep storage charge. Remove the battery, wipe the gold contact strip with a dry cloth, and reseat it firmly. A clean contact cycle lets the dock register the BMS handshake correctly. If the fault LED persists after reseating, leave the pack in the dock for 15 minutes — some Motorola docks run a pre-charge trickle below acceptance voltage before switching to full charge mode.

The CT250 drops to noticeably weaker audio and signal on a long shift — is this a bad cell?

This is voltage sag under sustained RF output, not a failed cell. As the pack discharges through a heavy-use shift, cell voltage drops toward the lower end of the NiMH range and the radio reduces TX power to protect the circuit. It is expected behaviour on NiMH chemistry under continuous load. To delay the onset, avoid leaving the radio keyed on an open channel for extended periods — sustained RF output drains the pack faster than normal PTT use. Recharge when the bar indicator drops to one bar.

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