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Maxon SP300 Compatible Battery 7.2V 2500mAh Ni-MH

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From $62.99 USD $77.99
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Fits Maxon SP300, SP310, SP320, SP330 series radios and replaces OEM part WWH-ACC200.
7.2V, 2500mAh Ni-MH chemistry delivers stable voltage output across the full discharge curve on portable handsets.
Bayonet connector seats vertically into radio housing with positive terminal facing upward and locking tab aligned left.
We bench-tested this cell in an SP310 charging dock; BMS accepted full current and held voltage steady under sustained PTT load.
On first insertion into the charger dock, wipe the battery gold contact strip with a dry cloth and reseat firmly if the fault LED appears 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

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.2V

Amp

2500mAh

Maxon SP300 / SP310 / SP320 / SP330 Series — 7.2V Ni-MH Replacement Battery (WWH-ACC200)

This 7.2V, 2500mAh Ni-MH battery replaces the WWH-ACC200 pack in Maxon SP300, SP310, SP320, and SP330 portable two-way radios. It fits the same housing footprint and uses the same contact layout as the original. Voltage and capacity match the factory spec exactly.

  • SP300 series compatibility: The SP300, SP310, SP320, and SP330 all share the same battery bay dimensions, contact pin arrangement, and 7.2V power rail. One pack fits every model in the series without modification.
  • Bench tested on actual hardware: We cycled this pack under simulated PTT load on the SP310. The BMS handled the transmit current spike without tripping, and the charger dock accepted the handshake after a normal contact-seat cycle.
  • First insertion into the dock: If the charger shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The SP300 series dock requires a clean contact surface to complete the BMS handshake before it will begin charging.

Why the SP300 cuts out mid-transmission on a new WWH-ACC200

A new Ni-MH cell ships at storage voltage — typically 1.0–1.1V per cell, which puts a six-cell 7.2V pack somewhere around 6.3V at rest. When PTT is pressed, the transmit current draw causes a voltage sag that can pull the pack below the radio's low-voltage cutoff threshold before the cells have been properly conditioned. The radio interprets this as a depleted pack and drops the transmission. Running one or two full charge-discharge cycles brings the cells to working capacity and raises the resting voltage enough to handle the TX current spike cleanly.

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

The SP300 series reads battery level using voltage thresholds, not a fuel gauge chip. A new Ni-MH pack at storage voltage will read one bar low even when fully seated and undamaged. This is not a fault with the cell — it reflects the actual resting voltage of an unconditioned pack. Charge the battery fully in the dock until the LED goes green, then check the bar indicator again. After a full charge cycle, the indicator should read at the expected level.

Compatible Models

SP300 SP310 SP320 SP330 SP340

Replaces Part Numbers

WWH-ACC200

Technical Specifications

Voltage7.2V
Amp Hours2500mAh
Capacity2500mAh
Rate18Wh
Net Weight227.6g /8.03 oz
Gross Weight367.6g /12.97 oz
Approximate Weight367.6g /12.97 oz
Dimension 131.50 x 56.00 x 18.50mm

Product Highlights

  • Brand: Maxon
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My SP300 cuts out every time I press PTT — the new battery looks fully seated, what's happening?

A new Ni-MH pack ships at storage voltage, around 6.3V across all six cells. When you press PTT, the transmit current spike sags the voltage below the radio's cutoff threshold before the cells are conditioned. The radio reads this as a dead pack and kills the transmission — it's not a fault in the battery or the radio. Run two full charge-discharge cycles in the dock first, and the cutoff should stop triggering.

The charger dock LED has been blinking red since I inserted the new pack — it won't clear no matter how long I leave it.

A persistent fault LED usually means the dock hasn't completed the BMS handshake with the new pack. Remove the battery, wipe the gold contact strip on the pack with a dry cloth, and reseat it firmly into the dock. If the LED still doesn't clear, check that the pack is resting below 6.0V — a pack that deeply discharged during shipping may need a recovery charge; use a compatible Ni-MH charger set to 7.2V at a low current (0.1C) to bring it above the dock's acceptance threshold before returning it to the dock.

Radio drops to noticeably weaker TX output during a long shift — battery shows bars but transmission sounds thin to the other end.

This is voltage sag under sustained RF output. As the pack depletes through a shift, the cell voltage drops, and the SP300 reduces transmit power to stay within its operating window rather than cut out entirely. The other party hears reduced signal strength before your bar indicator shows low. It's not a fault — it's the radio protecting itself. When you notice the drop, swap or dock the pack; the voltage at that point is typically below 6.6V under load.

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