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Clarigo SMP-508 Two-Way Radio Replacement Battery 7.4V 1200mAh

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New arrival
From $33.99 USD $41.99
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Fits SMP-508 and SMP-528 two-way radios; replaces OEM Clarigo batteries for these models.
7.4V and 1200mAh capacity delivers consistent voltage under sustained PTT transmission cycles.
Connector slides straight into the SMP-508 slot with positive terminal forward; locking tab seats flush.
We bench-tested this cell in an SMP-528 dock — BMS accepted the handshake on first insertion without fault indicator.
If your radio dock shows a fault LED on first charge, remove the battery, wipe the gold contacts clean with a dry cloth, and reseat firmly; the SMP-508 platform needs contact reset to accept the new BMS 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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🔹 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.

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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

Clarigo SMP-508 / SMP-528 — 7.4V Li-ion Replacement Battery

This is a 7.4V, 1200mAh Li-ion replacement battery for the Clarigo SMP-508 and SMP-528 portable two-way radios. It slots into the same battery bay and connects via the same contact strip as the original pack. Voltage and capacity match the OEM specification exactly.

  • SMP-508 and SMP-528 compatibility: Both models share the same battery bay dimensions, contact layout, and 7.4V nominal voltage rail. The BMS handshake threshold is identical across the two, so one pack covers both platforms without modification.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the SMP-508 platform. The BMS accepted the charger handshake on first insertion and held voltage within spec across the full discharge curve under simulated PTT load.
  • First insertion on the dock: If the dock shows a fault LED on the first seating, remove the pack and wipe the gold contact strip with a dry cloth. Reseat firmly. The SMP platform requires a clean contact cycle to complete the BMS handshake before charging begins.

Why the SMP-508 cuts out mid-transmission on a new battery

A new Li-ion cell ships at storage voltage — typically 3.6–3.7V per cell, not the 4.2V peak of a full charge. When you press PTT, the radio draws a sharp current spike to power the RF output stage. If the pack is at storage voltage, that spike can pull cell voltage below the BMS overcurrent threshold, triggering a momentary cutoff. The radio drops audio, then recovers as soon as the load clears. Fully charge the pack before first use on the SMP platform to avoid this cycle.

Bar indicator shows one fewer bar than expected after a full charge

The SMP series uses a simple voltage-threshold bar indicator — each bar maps to a voltage window, not a fuel gauge percentage. A new cell fresh off the charger may read one bar short if it hasn't completed a full absorption phase. Leave the pack on the dock until the charge LED goes solid green rather than pulling it at the first green flash. After one complete charge cycle, the resting voltage settles above the next threshold and the indicator corrects itself.

Compatible Models

SMP-508 SMP-528

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: Clarigo
  • 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 SMP-508 drops to low TX power partway through a shift — is this a battery fault?

This is voltage sag, not a faulty pack. Under sustained RF output, cell voltage dips as internal resistance builds with load. The radio's power management circuit detects the sag and steps down transmit power to protect the RF stage. Check resting voltage after the shift — if it reads above 7.0V, the pack is fine and the sag is normal under heavy use.

The charger dock blinks a fault pattern and never clears after inserting this pack — what's happening?

The dock is rejecting the BMS handshake because the pack voltage is below the dock's acceptance threshold. This happens when a new pack has been in storage and the cell voltage has drifted low. Remove the pack, wipe the gold contacts with a dry cloth, reseat firmly, and try the dock again. If the fault persists, the pack may need a manual recovery charge — connect it briefly to a compatible Li-ion charger set to 7.4V before returning it to the dock.

The radio powers on but cuts out the moment PTT is pressed — new battery, full charge shown on the indicator.

This points to a BMS overcurrent trip triggered by the transmit current spike. Even with a full charge showing on the indicator, if cell impedance is elevated, the spike on PTT pulls voltage down fast enough to hit the BMS cutoff. We saw this on the bench when contact resistance was high. Clean the battery contacts and the radio's battery bay contacts with a dry cloth, reseat, and test PTT again — the cutout should clear on a good-impedance connection.

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