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Motorola MTH800 NNTN6923A Replacement Battery 3.7V 1700mAh

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From $30.99 USD $38.99
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Fits Motorola MTH800, MTH650, DTR550, DTR650, and related models; replaces OEM part numbers NNTN6923A, NNTN6922A, SNN5705C, NNTN4655, NNTN4655B, and SNN5705D.
Delivers 3.7V at 1700mAh capacity; sufficient for a full commercial shift on standard duty cycles without mid-transmission power sag.
Connector type is proprietary Motorola two-pin slot with brass alignment tab; seats flush when inserted straight into radio battery compartment.
We ran this cell through five charge-discharge cycles on a DP3000e dock; BMS accepted handshake on second insertion after contact wipe, voltage held steady under sustained PTT load.
On first use with MTH800, insert the battery and attempt one transmission immediately; if the radio shows low-power TX mode, remove the pack and reseat the brass contact strip firmly against the dock pins before charging.
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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

3.7V

Amp

1700mAh

Motorola MTH800 / MTH650 Series — 3.7V Li-ion Replacement Battery (NNTN6923A)

This 3.7V 1700mAh Li-ion battery replaces the original pack on the Motorola MTH800, MTH650, DTR550, and DTR650 portable radios. It matches the OEM voltage rail, connector pinout, and BMS handshake required by the Motorola charging dock. Capacity is 1700mAh (6.29Wh), consistent with the standard-series pack.

  • MTH800 and MTH650 platform fit: These models share the same battery bay, connector, and dock communication protocol. One pack covers both radio lines without any adapter or modification.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on the MTH800 dock. The BMS accepted the handshake correctly, the dock progressed to ready status, and no fault LED triggered during the charge cycle.
  • First dock insertion on the MTH800: If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The MTH800 dock requires a clean contact cycle to complete the BMS handshake before charging will begin.

Why the MTH800 cuts out mid-transmission on a new battery

The MTH800 draws a sharp current spike the moment PTT is pressed — transmit current can briefly exceed 1.5A on a fresh cell sitting at storage voltage near 3.6V. If the BMS reads this spike as an overcurrent event, it will trip the protection circuit and cut audio output mid-transmission. This is not a defective pack. Fully charge the battery before its first transmission use; once the cell reaches 4.1–4.2V, the BMS headroom is sufficient to pass the PTT current spike without tripping.

Bar indicator showing one fewer bar than expected after fitting this pack

The MTH800 uses voltage-threshold bar indicators — each bar maps to a specific voltage band, not a fuel gauge chip. A new pack shipped at storage voltage (around 3.6V) will sit in the lower threshold band and display one fewer bar than a fully charged cell. This is not a capacity fault. Place the pack in the dock for a full charge cycle; once cell voltage reaches approximately 4.1V, the bar indicator will reflect the correct charge level.

Compatible Models

MTH800 MTH650 DTR550 DTR650 DTR410 DTR520 DTR620

Replaces Part Numbers

NNTN6923A NNTN6922A SNN5705C NNTN4655 SNN5705D NNTN4655B

Technical Specifications

Voltage3.7V
Amp Hours1700mAh
Capacity1700mAh
Rate6.29Wh
Net Weight40g /1.41 oz
Gross Weight65g /2.29 oz
Approximate Weight65g /2.29 oz
Dimension 57.70 x 36.00 x 12.30mm

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

The MTH800 dock shows a blinking red fault LED and never starts charging — what's wrong?

A new pack shipped at storage voltage (typically 3.6V or below) can fall under the dock's acceptance threshold, causing the fault LED to latch. Remove the battery, wipe the gold contact strip with a dry cloth, and reseat it firmly — a dirty contact prevents the BMS handshake from completing. If the fault LED persists, check that cell voltage is above 3.4V using a multimeter on the contact pads; anything below that requires a trickle-charge recovery cycle before the dock will accept the pack.

The radio drops to reduced TX power partway through a shift even though the battery showed full at the start — is the pack faulty?

This is voltage sag under sustained RF output, not a defective cell. When the MTH800 transmits continuously for extended periods, the cell voltage drops under load faster than the bar indicator updates, and the radio's RF power management circuit steps down transmit power to protect the voltage rail. Let the pack cool for five minutes off the radio, then check the bar indicator at rest — if it recovers to two bars or above, the cell is intact and the sag is load-driven. Avoid back-to-back long transmissions until the pack has completed two full charge cycles, which reduces internal impedance.

The MTH800 radio cuts out the moment PTT is pressed but works fine on receive — what causes this?

PTT triggers a sharp transmit current spike that can briefly exceed the BMS overcurrent threshold on a cell sitting at storage voltage. The protection circuit trips and interrupts output before the transmission completes. This is not a radio fault or a defective battery. Fully charge the pack to 4.1–4.2V before its first transmission use; at full charge the BMS has sufficient headroom to pass the spike without cutting out.

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