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Bendix-King RPU416 Compatible Battery 7.4V 1800mAh BPRP1100

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Fits Bendix-King RPU416, RPU599, RPV516 radios; replaces BPRP1100 and BPRP1500 OEM packs.
7.4V at 1800mAh delivers consistent transmit power across extended shifts without voltage sag.
Connector slides straight in with a positive stop tab; ensure the gold contact strip faces the radio dock.
We bench-tested this cell on a cold RPU416 startup; BMS accepted dock voltage within one cycle, no fault lockout.
On first dock insertion, if the charger shows a fault LED, remove the battery, wipe the gold contacts with a dry cloth, and reseat firmly—the Bendix platform requires a clean contact cycle for 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

Bendix-King RPU416 / RPU599 Series — 7.4V Li-ion Replacement Battery (BPRP1100)

This is a 7.4V, 1800mAh Li-ion battery for the Bendix-King RPU416, RPU599, RPV516, and RPV516A portable two-way radios. It replaces OEM part numbers BPRP1100, BPRP1500, and BPRP1500MH. The pack slots into the standard battery bay and connects via the same multi-pin contact strip as the original.

  • RPU/RPV platform fit: The RPU416, RPU599, RPV516, and RPV516A share the same 7.4V nominal rail, battery bay dimensions, and contact pin layout. One pack covers all four models without any adapter or modification.
  • Bench tested on actual hardware: We cycled the pack through full charge and discharge on the RPU416 platform. The BMS held cutoff at the correct low-voltage threshold and accepted the charger dock handshake on first insertion without triggering a fault LED.
  • First-insertion contact check: If the charger dock shows a fault LED after fitting this battery, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The RPU-series dock requires a clean contact surface to complete the BMS handshake before it begins the charge cycle.

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

The RPU416 draws a sharp current spike the moment PTT is pressed — transmit current can reach 1.5–2A in the first milliseconds of keying. If the replacement pack arrived at storage voltage (around 3.7V per cell), the BMS may interpret that spike as an overcurrent event and cut output before the RF stage completes its ramp. This is not a faulty battery. Run one full charge cycle to bring both cells to 4.2V before field use and the BMS trip threshold will sit well above normal transmit current.

Bar indicator showing one fewer bar than expected on a fully charged pack

The RPU416 reads battery level using voltage-threshold steps, not a fuel gauge chip. A new pack fresh off the charger may rest at 4.1V rather than 4.2V until the cells complete their first full absorption cycle, which causes the radio to display one bar below maximum. This is normal cell settling behaviour. After two full charge-discharge cycles the resting voltage stabilises at 4.2V and the bar indicator reflects the actual charge state correctly.

Compatible Models

RPU416 RPU599 RPV516 RPV516A RPV516B RPV599 RPV599A

Replaces Part Numbers

BPRP1100 BPRP1500 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: Bendix-King
  • 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 to low transmit power partway through a long shift — why does this happen with a new battery?

This is voltage sag under sustained RF output, not a faulty pack. As transmit time accumulates, cell voltage dips under load; once it crosses the radio's reduced-power threshold, the RPU416 automatically steps down TX output to protect the final stage. It is not a BMS fault. Charge the pack fully to 8.4V (4.2V per cell) before each shift and avoid leaving it on standby for days between uses, as shallow self-discharge lowers the headroom available before that sag threshold is reached.

The charger dock blinks a fault LED and never clears after I insert the new pack — what do I do?

The RPU-series dock rejects packs that arrive below its acceptance voltage, typically anything under roughly 6.0V at the terminals. A battery shipped in long-term storage can sit at 7.0V or lower, which some dock firmware reads as a damaged cell. Remove the pack, wipe both the battery and dock contact strips with a dry cloth, and reseat firmly. If the fault LED persists, place the pack in a second known-good charger — one full charge cycle brings the cell voltage into the dock's acceptance window and the fault clears on the next insertion.

The pack fits correctly but the dock never advances to a full-charge green light — it stays on charge indefinitely. What is causing this?

This points to a cell impedance mismatch between a new pack and the dock's charge-termination detection. The dock measures the rate at which terminal voltage rises; a new cell with slightly higher internal impedance causes that rise to look slower than expected, so the dock keeps topping up past the normal cut-off point. It is not harmful to the cells. Let the first charge run to natural termination — most RPU-series docks will eventually switch to green within four hours. After two full cycles, cell impedance drops and subsequent charges terminate at the normal time.

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