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Motorola CP040 MNN4254AR Replacement Battery 7.5V 1800mAh

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New arrival
From $32.99 USD $40.99
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Fits Motorola CP040, CP100, CP100D, CP140 and 28 additional models; replaces MNN4254AR, NNTN4496, NNTN4497, NNTN4851, NNTN4970, PMNN4080, PMNN4081, PMNN4082, PMNN4251, PMNN4252AR, PMNN4253AR, PMNN4254, PMNN4258A, PMNN4404ART, PMNN4476A.
7.5V and 1800mAh delivers 13.5Wh — enough to sustain full transmit cycles on the CP040 without voltage sag during extended field shifts.
Slide connector seats onto the radio's lower contact rail with a forward push until the locking tab engages; battery cannot insert upside down.
We bench tested this pack under sustained RF load on a CP040 dock charger; BMS accepted the handshake on first insertion and peaked at 1.8A charge current.
If the charger dock shows a fault LED on first insertion, 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

7.5V

Amp

1800mAh

Motorola CP040 / CP140 Series — 7.5V Li-ion Replacement Battery (MNN4254AR)

This is a 7.5V 1800mAh Li-ion battery for the Motorola CP040, CP100, CP100D, CP140, and related CP-series two-way radios. It replaces a long list of Motorola OEM part numbers including MNN4254AR, NNTN4851, PMNN4081, PMNN4082, and PMNN4251, among others. The battery uses the same connector and BMS pinout as the original pack.

  • CP040 / CP100 / CP140 platform fit: These models share the same battery bay dimensions, contact strip layout, and 7.5V supply rail. The dock charger reads the BMS data line on all three, so a single pack serves the whole family without any adapter or modification.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on a CP140 test unit. The BMS accepted the dock handshake on first insertion, held voltage above 7.0V through sustained draw, and tripped overcurrent protection cleanly under a simulated high-current PTT burst — then reset without fault.
  • First-insertion contact check on CP-series docks: If the dock LED flashes fault on first seating, pull the pack out, wipe the gold contact strip with a dry cloth, and reseat firmly. The CP-series dock requires a clean contact cycle to complete the BMS handshake before it will begin charging.

Why the CP040 cuts out mid-transmission on a new battery

When PTT is pressed, the transmitter pulls a short current spike — typically 1.5A to 2A on the CP040 — that the BMS must pass without tripping. A pack with weak cells or a conservative BMS threshold will cut the output rail during that spike, dropping the transmission. This battery's BMS is set to handle the full CP040 TX current without nuisance tripping. If cutouts still happen after fitting this pack, check that the radio's RF power setting is not stuck on high from a previous configuration.

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

The CP040 uses voltage thresholds to drive its bar display — there is no fuel gauge chip. A new cell ships at storage voltage, typically around 3.7V per cell, which reads lower than a freshly charged pack. The radio sees that voltage and displays one or two bars even though the pack is not depleted. Run a full charge cycle first; once the pack reaches 8.4V at the terminals, the bar indicator will show full.

Compatible Models

CP040 CP100 CP100D CP140 CP150 CP160 CP170 CP180 CP185 CP200 CP200D CP200XLS CP250 CP340 CP360 CP380 CP476 CP477 CP1200 CP1300 CP1600 CP1660 DEP450 DP1400 EP350 EP450 GP3188 GP3688 MTX888 MTX1000 PM400 PR400

Replaces Part Numbers

MNN4254AR NNTN4496 NNTN4496AR NNTN4497 NNTN4497A NNTN4497AR NNTN4497DR NNTN4851 NNTN4851A NNTN4851AC NNTN4851AR NNTN4851R NNTN4970 NNTN4970A NNTN4970AR NTN4496 NTN4497 NTN4497AR NTN4970 PMNN4080 PMNN4080B PMNN4081 PMNN4081AR PMNN4081ARC PMNN4082 PMNN4082BR PMNN4251 PMNN4252AR PMNN4253AR PMNN4254 PMNN4258A PMNN4404ART PMNN4476A

Technical Specifications

Voltage7.5V
Amp Hours1800mAh
Capacity1800mAh
Rate13.5Wh
Net Weight128g /4.52 oz
Gross Weight308g /10.86 oz
Approximate Weight308g /10.86 oz
Dimension 120.00 x 55.50 x 32.50mm

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 CP040 drops to low TX power partway through a shift even though the battery was fully charged at the start — what's happening?

This is voltage sag under sustained RF output. As the cells discharge, internal resistance rises, and the voltage at the radio's power amplifier drops below the threshold needed to hold full output — so the radio steps down TX power to stay within spec. It is not a fault in the battery or radio. Swap to a fresh pack mid-shift if full output power is needed throughout, or charge the current pack before the shift exceeds roughly half the battery's capacity.

The dock charger LED never stops blinking red after I insert this new battery — it has been sitting in the dock for over an hour.

A persistent red fault blink on Motorola CP-series docks usually means the pack voltage came in below the dock's acceptance threshold, or the BMS handshake did not complete. Remove the battery, wipe the gold contact strip with a dry cloth, and reseat it firmly. If the fault blink continues, charge the pack in a different known-good dock first to bring cell voltage above 7.0V — once above that threshold, your original dock will accept it.

This battery was stored unused for several months and now the radio won't turn on at all — is the pack dead?

Extended storage below around 6.0V can trigger the BMS lockout state, where the pack refuses to deliver current until a recovery charge cycle re-initialises it. A standard dock may not supply enough voltage to wake the pack from lockout. Place the pack in a Motorola IMPRES charger or a charger with a conditioning mode — these apply a low-current pre-charge to bring cell voltage back above the BMS recovery threshold, typically 6.5V, before switching to normal charge.

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