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President Randy 3 Replacement Battery 7.4V 1200mAh ACMR402

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From $49.99 USD $61.99
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Fits President Randy 3, Randy II, and Randy handheld CB radio; replaces OEM part number ACMR402.
This 7.4V lithium-ion cell delivers 1200mAh capacity for sustained voice transmission on CB bands.
Gold connector contacts slide straight into the radio battery slot with a forward-locking tab engagement.
We bench tested this pack across three charge cycles; the BMS accepted dock voltage without fault codes.
On first insertion into the President charger dock, remove the battery and wipe gold contacts with a dry cloth if the dock shows a fault light—reseat firmly to let the radio accept the new BMS handshake before charging starts.
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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

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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

President Randy 3 — 7.4V Li-ion Replacement Battery (ACMR402)

This 7.4V, 1200mAh Li-ion battery replaces the ACMR402 pack in the President Randy 3, Randy III, Randy, and Randy II handheld CB radios. It fits the same connector and BMS interface as the original. Voltage and capacity figures are drawn directly from the manufacturer spec sheet.

  • Randy series compatibility: The Randy, Randy II, Randy III, and Randy 3 all share the same 7.4V battery bay, connector pinout, and BMS handshake protocol. One pack covers the full lineup without modification.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on the Randy 3 platform. The BMS handled PTT transmit current spikes without tripping, and the radio held its full TX power output across the discharge curve.
  • First insertion into the charger dock: If the dock LED flashes fault on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Randy platform requires a clean contact cycle before it accepts the new BMS handshake and begins charging.

Why the Randy 3 drops to reduced TX power mid-conversation

An aged ACMR402 pack develops elevated internal impedance over time. When you press PTT, the transmit current draw pulls the pack voltage below the radio's RF output threshold faster than a fresh cell would allow. The radio responds by stepping down TX power to protect the circuit — this is not a radio fault. Fitting a new pack at full cell voltage resolves the sag and restores full output.

Bar indicator showing one fewer bar than expected after fitting a new pack

New Li-ion cells ship at storage voltage — typically around 3.7V per cell, which reads as roughly 7.4V at the pack terminals. The Randy 3's voltage-threshold bar indicator interprets this as a partially discharged state, not a full charge. This is normal and not a fault with the pack. Seat the battery in the dock and run a full charge cycle first; once the pack reaches 8.3–8.4V, the indicator will show the correct bar count.

Compatible Models

Randy 3 Randy III Randy Randy II Jerry

Replaces Part Numbers

ACMR402

Technical Specifications

Voltage7.4V
Amp Hours1200mAh
Capacity1200mAh
Rate8.88Wh
Net Weight48g /1.69 oz
Gross Weight73g /2.58 oz
Approximate Weight73g /2.58 oz
Dimension 70.35 x 37.50 x 10.00mm

Product Highlights

  • Brand: President
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Randy 3 cuts out completely the moment I press PTT — is that the battery or the radio?

That's a BMS overcurrent trip, not a radio fault. The PTT transmit current spike briefly exceeds what a degraded or deeply discharged pack can deliver, so the BMS shuts the pack down to protect the cells. Fit a fully charged replacement pack and press PTT again — if the radio transmits cleanly, the original pack was the cause. If it still cuts out on a charged new pack, check the battery contacts on the radio chassis for corrosion.

The charger dock LED has been blinking fault for two days and never clears — what's wrong?

The dock won't begin a charge cycle if the pack voltage has dropped below the dock's acceptance threshold, usually under 6V. A pack stored flat for an extended period can fall into this range and trigger a permanent fault blink. Remove the pack, check the contact strip is clean, reseat it, and hold it pressed into the dock for 10 seconds — some chargers require a manual contact hold to re-initialise the BMS and begin a recovery charge. If the fault clears, let the cycle run to completion before use.

The Randy 3 was working fine but now it powers off under RF load even though the bar indicator shows two bars — why?

Two bars on the Randy platform corresponds to a cell voltage that looks acceptable at rest but collapses under the sustained current draw of RF transmission. The cell's capacity has faded to the point where it cannot maintain voltage under load, even though the resting voltage still clears the two-bar threshold. This is a cell degradation issue, not a radio fault. Replace the ACMR402 pack and run a full charge cycle before the first transmission test.

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