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Regency-Relm RPU416 BPRP1100 7.4V Replacement Battery

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New arrival
From $39.99 USD $49.99
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Fits Regency-Relm RPU416, RPU499, RPU516, RPV416 radios; replaces BPRP1100, BPRP1500, BPRP1500MH.
Voltage 7.4V, capacity 1800mAh delivers sustained RF output across extended shifts without mid-transmission sag.
Gold contact strip slides into radio battery slot with firm click; locking tab seats flush against radio frame.
Bench test: new pack accepted full charge in dock within two cycles; BMS held 7.4V under 5A PTT draw.
If the charger dock shows a fault LED on first insertion, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly — the Regency 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.

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

7.4V

Amp

1800mAh

Regency-Relm RPU416 / RPU499 Series — 7.4V Li-ion Replacement Battery (BPRP1100)

This is a 7.4V, 1800mAh lithium-ion battery for the Regency-Relm RPU416, RPU499, RPU516, and RPV416 portable two-way radios. It replaces OEM part numbers BPRP1100, BPRP1500, and BPRP1500MH. Capacity is sourced from the cell spec sheet, not estimated.

  • RPU416 / RPU499 / RPU516 / RPV416 platform fit: These radios share the same battery bay geometry, contact rail spacing, and 7.4V BMS handshake threshold. One pack covers the full group without modification.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on the RPU416 platform. The BMS negotiated the handshake on first insertion and held voltage within the radio's accepted operating band through the full discharge curve.
  • First-insertion contact check: If the charger dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Regency-Relm dock requires a clean contact cycle to accept the BMS handshake before charging begins.

Why the RPU416 cuts out mid-transmission on a new BPRP1100

When PTT is pressed, transmit current spikes well above the radio's standby draw. A new pack shipped at storage voltage — typically around 3.7V per cell — sits close to the BMS overcurrent trip threshold under that sudden load. The BMS reads the surge as a fault condition and briefly disconnects the output rail, which kills the transmission. One full charge cycle brings both cells to 4.2V, raising the voltage headroom enough that the BMS no longer trips on the TX spike.

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

The RPU416 uses a simple voltage-threshold bar indicator — each bar corresponds to a specific voltage window, not a percentage from a fuel gauge chip. A new cell delivered at storage voltage reads one or two bars low even though the pack is not depleted. This is not a fault with the cell. Charge the pack fully to 8.4V on the dock, then power the radio on — the bar indicator will reflect the correct charge state.

Compatible Models

RPU416 RPU499 RPU516 RPV416 RPV449 RPV516 RPV599 RPV599 RPV599A Plus

Replaces Part Numbers

BPRP1100 BPRP1500 BPRP1500MH

Technical Specifications

Voltage7.4V
Amp Hours1800mAh
Capacity1800mAh
Rate13.32Wh
Net Weight101g /3.56 oz
Gross Weight241g /8.50 oz
Approximate Weight241g /8.50 oz
Dimension 111.00 x 60.30 x 17.60 mm

Product Highlights

  • Brand: Regency-Relm
  • 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 RPU416 drops out of transmit a few seconds after I press PTT — is the new battery faulty?

It's not faulty. New lithium-ion cells ship at storage voltage, roughly 3.7V per cell, and the BMS trips on the transmit current spike before the pack has been conditioned. Put the battery on the dock for a full charge to 8.4V before use. After that first full cycle, the BMS has enough voltage headroom to handle the TX surge without cutting out.

The charger dock is blinking a fault code and won't start charging the new BPRP1100 — what's happening?

The dock is rejecting the pack because the contact rail hasn't completed a clean handshake cycle. Remove the battery, wipe the gold contacts on both the pack and the dock with a dry cloth to clear any oxidation or film from storage, then reseat the pack firmly until it clicks. If the fault LED persists, the cell voltage may have dropped below the dock's acceptance threshold — around 5.0V total — during extended shelf storage, and the pack will need a trickle pre-charge before the dock accepts it.

Radio is running fine but the bar indicator drops a bar after about an hour of normal use — is this normal cell fade or something else?

On the RPU416, each bar on the indicator maps to a fixed voltage window. Sustained RF output pulls steady current and causes real voltage sag across the cells, which the radio reads as a step down in charge state even though the pack isn't depleted. This is normal behaviour under transmit load, not accelerated fade. If the bar recovers when the radio returns to standby, the pack is healthy — if it stays low even off-load, measure the resting voltage after five minutes; a healthy pack should read above 7.8V at rest.

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