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Horizon HX870 Replacement Battery 7.4V 1100mAh SBR-13LI

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Fits Horizon HX870 and HX870E radios; replaces OEM part number SBR-13LI.
7.4V, 1100mAh lithium-ion delivers full transmit power on sustained RF output cycles.
Gold contact strip mates vertically into the radio's dock; locking tab seats flush left.
We bench-tested this cell through fifty charge cycles on a standard two-way charger; BMS accepted dock handshake without fault codes on first insertion.
On first use, if the charger dock shows a fault LED, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly.
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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

1100mAh

Horizon HX870 / HX870E — 7.4V Li-ion Replacement Battery (SBR-13LI)

This is a 7.4V, 1100mAh Li-ion replacement battery for the Horizon HX870 and HX870E handheld marine VHF radios. It replaces OEM part SBR-13LI directly. The pack slots into the same battery bay and uses the same contact layout as the original.

  • HX870 and HX870E compatibility: Both models share the same battery bay geometry, contact pin spacing, and 7.4V nominal rail. The BMS handshake protocol is identical across both variants, so one pack covers either unit without modification.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the HX870 platform. The BMS handled transmit-load current spikes cleanly and did not trigger overcurrent cutoff during sustained PTT presses.
  • First-insertion contact check: If the dock LED flashes a fault code on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The HX870 charging dock requires a clean contact cycle to complete the BMS handshake before it will begin charging.

Why the HX870 cuts out mid-transmission on a freshly inserted battery

A new Li-ion cell ships at storage voltage — typically 3.6–3.7V per cell, putting the pack around 7.2V. Under the transmit current spike when PTT is pressed, that starting voltage can sag enough to trip the radio's low-voltage cutoff before the pack has gone through its first full charge. The fix is straightforward: charge the pack fully before the first transmit session. After a complete charge cycle the resting voltage sits above 8.0V and the sag margin is restored.

Bar indicator showing one fewer bar than expected after swap

The HX870 reads battery level through simple voltage thresholds, not a fuel gauge chip. A new pack at storage voltage reads lower on those thresholds than a fully charged cell, so the radio displays one or two bars even though the pack is not depleted. This is not a cell fault or a capacity issue. Charge the pack to completion — the indicator should step up to full bars once resting voltage clears the top threshold, typically above 8.2V.

Compatible Models

HX870 HX870E

Replaces Part Numbers

SBR-13LI

Technical Specifications

Voltage7.4V
Amp Hours1100mAh
Capacity1100mAh
Rate8.14Wh
Net Weight59g /2.08 oz
Gross Weight84g /2.96 oz
Approximate Weight84g /2.96 oz
Dimension 66.15 x 41.05 x 17.48mm

Product Highlights

  • Brand: Horizon
  • 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 HX870 drops to low transmit power partway through a shift even though the battery was fully charged at the start — what's causing that?

Sustained RF output draws more current than standby, and if cell impedance is even slightly elevated, voltage sags under that load and the radio steps down TX power to protect itself. This is different from a hard cutout — the radio stays on but backs off output to stay within its voltage floor. Check the resting voltage of the pack between transmissions with a multimeter; it should read above 7.8V when not under load. If it drops below 7.5V under keying, the cells are not holding the voltage rail and the pack needs replacement.

The charger dock fault LED won't clear no matter how many times I reinsert the SBR-13LI — how do I get the dock to accept the pack?

A fault LED that never clears usually means the pack voltage has dropped below the dock's acceptance threshold — typically below 6.0V — and the dock refuses to initiate a charge cycle as a safety measure. Remove the pack, wipe all gold contacts on both the battery and the dock with a dry cloth, and reseat firmly to rule out a contact issue first. If the fault LED still doesn't clear, the pack may need a recovery charge from a compatible external Li-ion charger set to 7.4V before the dock will accept it. Once resting voltage is back above 7.0V, reinsert into the dock and the fault LED should extinguish.

The HX870 shows a full battery immediately after I press PTT for the first time, then the bars drop suddenly — is the pack defective?

This is a BMS overcurrent response, not a defective cell. The transmit current spike on first PTT press is the highest current draw the pack will see, and if the BMS trips on that spike it momentarily disconnects the output, causing the bar indicator to reset. Let the pack complete one full charge cycle before the first transmission — this brings cell voltage up to a level where the BMS has enough headroom to absorb the inrush without cutting off. If the dropout persists after a full charge, check that the battery contacts are fully seated and free of debris before concluding the pack is faulty.

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