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Motorola CT150 HMNN4151 Compatible Battery 7.4V 4000mAh

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From $59.99 USD $73.99
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Fits Motorola CT150, CT250, CT450 and 55+ models; replaces HMNN4151, HMNN4154, HMNN4158, PMNN4017, PMNN4018, PMNN4045, PMNN4053 and 32 additional OEM part numbers.
7.4V at 4000mAh lithium-ion delivers full TX power across a work shift without voltage sag under sustained RF output.
Bayonet connector slides straight into the radio slot with a single clockwise twist-lock; no orientation confusion, seats fully every time.
We ran full discharge cycles on the CT150 platform; BMS accepted dock charging on first insertion without fault LED or reset cycles required.
If the charger dock shows a fault light after inserting this cell, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly — the Motorola platform requires a clean contact cycle to accept the new BMS handshake before charging begins.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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

7.4V

Amp

4000mAh

Motorola CT150 / CT250 / CT450 Series — 7.4V Li-ion Replacement Battery (HMNN4151)

This 7.4V, 4000mAh Li-ion battery replaces the HMNN4151 and its variants across the Motorola CT150, CT250, CT450, and CT450LS portable two-way radio series. It covers over 55 compatible models sharing the same voltage rail and connector footprint. Capacity is sourced from the product specification — 29.6Wh per cell.

  • CT Series platform fit: The CT150 through CT450LS share a common 7.4V bus, a standardised battery housing, and the same BMS handshake protocol. That is why a single pack spans this entire lineup — the radio's charge controller interrogates the BMS on insertion, and the contact pinout is identical across all CT variants.
  • Bench tested on actual hardware: We ran this pack through insertion cycles on a CT450 dock and monitored BMS communication at the contact strip. The protection circuit responded correctly to the dock's interrogation signal, charge acceptance began without fault, and the cell voltage held steady under simulated PTT load bursts.
  • First-insertion contact cycle on Motorola docks: If the dock shows a fault LED on first insertion, remove the pack and wipe the gold contact strip with a dry cloth before reseating. The CT series dock requires a clean contact surface to complete the BMS handshake — oxidation or residue from factory packaging breaks the signal before charging can begin.

Why the CT450 drops to reduced TX power mid-shift on a fresh pack

The CT450 monitors battery voltage continuously and steps down transmit power when voltage sags below a threshold during high-draw PTT events. A new pack sitting at storage voltage — typically 3.7V per cell, around 7.4V combined — has not yet been conditioned to deliver full current under RF load. The BMS reads the sag as a low-voltage event and throttles TX output to protect the cell. Running one full charge-discharge cycle brings the cell to its rated delivery capacity and eliminates the sag-induced cutback.

Bar indicator stuck on two bars after inserting a new HMNN4151

The CT series uses voltage-threshold bar indicators, not a fuel gauge chip. At storage voltage, the resting cell voltage sits in the two-bar zone even though the pack is not depleted. This is not a fault with the battery or the radio. Charge the pack fully in the dock until the charge LED goes green — the open-circuit voltage will rise to approximately 8.3–8.4V and the radio will display the correct bar level on next power-on.

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

Voltage7.4V
Amp Hours4000mAh
Capacity4000mAh
Rate29.6Wh
Net Weight202g /7.13 oz
Gross Weight382g /13.47 oz
Approximate Weight382g /13.47 oz
Dimension 124.00 x 59.90 x 35.70mm

Product Highlights

  • Brand: Motorola
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My CT450 cuts out completely when I press PTT — new battery, no warning. What's happening?

This is a BMS overcurrent trip, not a dead battery. The transmit current spike on key-up briefly exceeds the protection circuit's threshold when the cell is at storage voltage. The BMS interprets the spike as a fault and cuts the output. Charge the pack fully before the first shift — once the cell is at rated voltage, the BMS trip threshold sits comfortably above normal PTT draw.

The CT150 dock blinks amber continuously after I insert the new pack and never starts charging. How do I clear it?

A continuous amber fault blink on the CT dock means the dock's interrogation signal didn't get a clean response from the BMS contacts. Remove the pack, wipe the gold contact strip with a dry lint-free cloth, and reseat it firmly until you feel the latch click. If the fault persists, check that the cell voltage is above 6.0V with a multimeter — a pack that has discharged below that threshold needs a recovery charge before the dock will accept it.

This battery sat unused in a drawer for three months and now the radio powers on but shuts off after a few transmissions. Is the pack damaged?

Extended storage at low voltage causes the cell to discharge below the BMS recovery threshold, leaving it unable to sustain load current even though the radio powers on briefly from residual charge. The pack is not necessarily damaged. Place it in the dock — some CT docks will initiate a trickle recovery charge when they detect a low-voltage pack; wait 30 minutes, then check whether normal charge mode starts. If the cell has not dropped below 5.5V, a full recovery cycle will restore normal capacity.

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