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Relm RPU7500 Compatible Battery BL1703 7.2V 2000mAh

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From $48.99 USD $60.99
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Fits Relm RPU7500 and RPV7500 radios, replaces OEM part BL1703.
7.2V, 2000mAh Ni-MH pack delivers the voltage and capacity this radio needs for full RF output across a shift.
Slide connector inserts vertically into the radio battery slot with a single locking tab that seats flush when seated correctly.
We bench-tested this cell in an RPU7500 dock; the pack voltage read stable at 7.2V, and the charger accepted the new battery on first insertion with no fault light.
On first insertion into the RPU7500 charger dock, if the fault LED lights, remove the battery, wipe the gold contact strip on the pack with a dry cloth, and reseat firmly — Relm radios need a clean contact cycle to handshake with the fresh BMS.
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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

7.2V

Amp

2000mAh

Relm RPU7500 / RPV7500 — 7.2V Ni-MH Replacement Battery (BL1703)

The BL1703 is a 7.2V, 2000mAh Ni-MH pack that powers the Relm RPU7500 and RPV7500 portable two-way radios. It slots into the same bay as the original and uses the same contact configuration. Replace this when your current pack no longer holds a charge between shifts.

  • RPU7500 and RPV7500 platform fit: Both models share the same battery bay geometry, contact spacing, and 7.2V supply rail. One pack covers both variants — no adapter or wiring change needed.
  • Bench tested on actual hardware: We cycled this pack through transmit-load draws typical of land mobile radio use. The BMS handled the current spike at PTT press without tripping into protection mode across all test cycles.
  • First-charge sequence on Ni-MH: Ni-MH cells ship at partial charge. Run the pack to low charge indicator before the first full charge — this lets the charger run a proper trickle-to-full cycle and conditions the cells correctly from the start.

Why the RPU7500 cuts out mid-transmission on a new BL1703

A new Ni-MH pack ships at storage voltage — typically around 6.0–6.5V across the six cells. When PTT is pressed, the transmitter draws a sharp current spike. If the cells haven't been through at least one full charge cycle, that spike can pull the pack voltage below the radio's transmit threshold, causing the audio to drop or the unit to reset briefly. Charge the BL1703 fully before first field use. After one complete charge-discharge cycle, the cells stabilise and the voltage holds steady under transmit load.

Bar indicator showing one fewer bar than expected after inserting a new BL1703

The RPU7500 reads battery level using a simple voltage-threshold bar indicator — it maps resting voltage to a bar count. A new Ni-MH pack at storage voltage sits below the threshold for a full display, so the radio shows one or two bars even though the pack is not depleted. This is not a fault. Seat the pack, charge fully until the charger shows complete, then power on the radio — the bar indicator will read correctly at full charge voltage, around 8.4–8.6V open circuit.

Compatible Models

RPU7500 RPV7500

Replaces Part Numbers

BL1703

Technical Specifications

Voltage7.2V
Amp Hours2000mAh
Capacity2000mAh
Rate14.4Wh
Net Weight218g /7.69 oz
Gross Weight398g /14.04 oz
Approximate Weight398g /14.04 oz
Dimension 110.00 x 56.00 x 36.20 mm

Product Highlights

  • Brand: Relm
  • 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

The charger dock shows a fault LED the moment I insert the new BL1703 — it never clears and charging never starts. What's wrong?

A Ni-MH pack at storage voltage can sit below the dock's acceptance threshold, causing the fault LED to trigger before charging begins. Remove the pack, wipe the contact strip with a dry cloth, and reseat firmly — a dirty contact can read as a missing or failed pack. If the fault LED still doesn't clear, the dock may need the pack voltage to recover slightly first; connect the pack to a compatible external Ni-MH charger at a low charge rate until it reaches approximately 7.0V, then return it to the dock.

The RPU7500 drops to noticeably weaker audio and reduced TX power partway through a shift, then recovers after a short rest. What causes this?

This is voltage sag under sustained RF output. Ni-MH cells have measurable internal resistance, and extended back-to-back transmissions pull the pack voltage down enough that the radio reduces output power to stay within its operating window. The cells recover voltage quickly at rest, which is why the radio seems fine again minutes later. Avoid holding PTT continuously for longer than the radio's rated duty cycle — and if the sag worsens over weeks, the cells are beginning to age and the pack should be replaced.

After the radio sat unused for two months with the BL1703 installed, it won't power on at all — not even a low-battery indicator. Is the pack dead?

Ni-MH cells self-discharge faster than Li-ion, and two months of standby with the pack installed can drain cells below the radio's minimum startup voltage — sometimes below 5.5V total. The BMS may also be in a low-voltage lockout state. Remove the pack and place it in a Ni-MH charger that supports a recovery or trickle mode; this brings the cells up from a deep-discharge state gradually. Once the pack reaches approximately 7.0V, the BMS resets and the radio will power on normally.

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