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Motorola Clarigo SMP-508 7.4V Replacement Battery 60Q137301-C

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Fits Motorola Clarigo SMP-508 and SMP-528 two-way radios; replaces OEM part 60Q137301-C.
7.4V, 1200mAh Li-ion cell delivers stable transmit power across standard eight-hour shifts.
Straight slide connector with single locking tab; seats firmly into radio battery slot without force.
We bench-tested with SMP-528 radio on sustained PTT cycles; BMS accepted dock charge handshake on first insertion.
If the charger dock shows a fault LED 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.
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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.

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⚠️ 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

1200mAh

Motorola Clarigo SMP-508 / SMP-528 — 7.4V Li-ion Replacement Battery (60Q137301-C)

This 7.4V 1200mAh Li-ion battery replaces the OEM 60Q137301-C pack in the Motorola Clarigo SMP-508 and SMP-528 two-way radios. It matches the original voltage rail and connector, so it seats and communicates with the radio's BMS without modification. Dimensions are 94.50 × 54.60 × 14.10mm — same footprint as the factory pack.

  • SMP-508 and SMP-528 compatibility: Both models run the same 7.4V rail, share the same connector pinout, and use an identical BMS handshake sequence. One pack covers both units on your fleet.
  • Bench tested on actual hardware: We cycled this pack through full charge and transmit-load discharge on the SMP-508 platform. The BMS held cutoff cleanly at low voltage and accepted charge without fault on a standard Motorola dock.
  • First insertion into the dock: If the dock LED shows a fault on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat it firmly. The SMP-series dock requires a clean contact cycle to initiate the BMS handshake before it begins charging.

Why the SMP-508 cuts out mid-transmission on a fresh 60Q137301-C pack

Pressing PTT drives a sharp current spike — the SMP-508 draws significantly more current during transmit than in standby. If the replacement pack ships at storage voltage (typically around 3.7–3.8V per cell), the BMS can interpret that spike as an overcurrent event and trip the protection circuit. This interrupts the transmission instantly, even though the battery is not defective. Fully charge the pack before first use — let the dock reach green — then the cells will be at full voltage and the BMS will handle the transmit spike without tripping.

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

The SMP-508 and SMP-528 use a voltage-threshold bar indicator, not a fuel gauge chip. When a new pack arrives at storage voltage rather than full charge, the radio reads a lower voltage and displays fewer bars than the battery's true capacity warrants. This is not a fault with the cell — it is the radio responding accurately to the current resting voltage. Charge the pack fully on the dock until the LED goes green, then reinsert it and the bar display will reflect full charge.

Compatible Models

Clarigo SMP-508 Clarigo SMP-528 SMP-508 SMP-528

Replaces Part Numbers

60Q137301-C

Technical Specifications

Voltage7.4V
Amp Hours1200mAh
Capacity1200mAh
Rate8.88Wh
Net Weight76.2g /2.69 oz
Gross Weight126.2g /4.45 oz
Approximate Weight126.2g /4.45 oz
Dimension 94.50 x 54.60 x 14.10mm

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 SMP-508 cuts out the moment I press the PTT button — is the new battery faulty?

Almost certainly not. PTT draws a sharp current spike, and if the pack arrived at storage voltage, the BMS can trip its overcurrent protection during that spike and cut the circuit. The radio goes silent, but the battery is intact. Charge the pack fully on the dock until the LED goes green before putting it into service — a full charge raises cell voltage high enough that the BMS handles the transmit spike without tripping.

The dock LED has been blinking red for an hour since I inserted the new 60Q137301-C — what clears it?

A blinking fault LED on the Motorola dock usually means the pack voltage is below the dock's acceptance threshold, or the contact strip is not making a clean connection. Remove the battery, wipe the gold contacts with a dry cloth, and reseat it firmly — the SMP-series dock needs a solid contact cycle to initiate the BMS handshake. If the fault persists, leave the pack seated for 10–15 minutes; some Motorola docks have a trickle pre-charge phase that runs silently before the LED switches to a normal charge indication.

The radio drops to noticeably weaker audio and shorter transmit range partway through a shift — battery or radio fault?

This is voltage sag under sustained RF output. As the cells discharge, voltage drops, and the SMP-508 reduces transmit power to protect the RF circuit — range and audio clarity both fall as a result. It is a normal protection behaviour, not a radio fault. The fix is to swap to a charged pack when the bar indicator drops to one bar, rather than running the battery down to cutoff, which puts more stress on the cells and accelerates capacity fade over time.

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