Standard Horizon HX400IS Compatible Battery 7.4V 3200mAh SBR-29LIIS
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Standard Horizon HX400IS Compatible Battery 7.4V 3200mAh SBR-29LIIS - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Standard Horizon HX400IS Compatible Battery 7.4V 3200mAh SBR-29LIIS - is backordered and will ship as soon as it is back in stock.
Voltage
7.4V
Amp
3200mAh
Standard Horizon HX400IS / HX400 — 7.4V Li-ion Replacement Battery (SBR-29LIIS)
This 7.4V, 3200mAh Li-ion battery replaces the SBR-29LIIS, FNB-115LIIS, SBR-45LIIS, and SBR-45LI packs in the Standard Horizon HX400IS and HX400 handheld marine radios. It delivers 23.68Wh of capacity through the same BMS interface the radio expects at power-on. Voltage and connector match the OEM spec exactly.
- HX400IS and HX400 compatibility: Both models share the same battery bay geometry, connector pinout, and 7.4V voltage rail. The BMS handshake on either radio reads pack voltage and cell count before enabling transmit — this pack passes that check on both variants without modification.
- Bench tested on actual hardware: We ran the pack through power-on, PTT transmit cycles, and charger dock insertion on the HX400 platform. The BMS correctly flagged overcurrent during back-to-back transmit bursts and recovered within two seconds, which is normal protection behavior on this radio.
- First dock insertion on the HX400 charger: If the dock shows a fault LED on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The HX400 charger requires a clean contact cycle to register the new BMS before it begins charging.
Why the HX400IS cuts out mid-transmission on a freshly inserted pack
The HX400IS draws a sharp current spike the moment PTT is pressed — transmit current briefly exceeds standby draw by a factor of several times. If the battery contacts are even slightly dirty or the pack is not fully seated, the BMS sees a voltage dip that triggers overcurrent protection and kills output. This is not a faulty battery. Wipe the contacts, press the pack fully into the bay until it clicks, and the cutout stops. If it continues, check that the radio's battery bay contacts are not bent or oxidised.
Bar indicator showing one fewer bar than expected on a new SBR-29LIIS
New Li-ion cells ship at storage voltage — typically around 3.7V per cell, not the 4.2V per cell that represents a full charge. The HX400 reads pack voltage against fixed thresholds to set bar count, so a new pack straight out of packaging will often show one bar lower than full. This is not a capacity defect. Place the pack in the dock and charge to completion — the indicator will read correctly once cell voltage reaches approximately 8.4V across the pack.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Standard 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 HX400IS transmits fine for the first few calls, then the audio breaks up and the radio seems to drop power — why?
This is voltage sag under sustained RF output. As transmit cycles stack up, a cell with elevated internal impedance drops voltage faster than the radio's BMS threshold allows, and the radio steps down TX power to protect the circuit. It is not a radio fault. Check that the pack contacts are clean, then run a full charge cycle — if sag continues after a full charge, the original cell has degraded past the point where surface voltage reflects true capacity.
The HX400 dock blinks the charge LED but never clears to solid green — the pack has been in there for hours.
A blinking LED that never resolves usually means the pack arrived below the dock's acceptance voltage threshold. The charger on the HX400 platform will not enter full charge mode if it reads cell voltage as critically low. Remove the pack, wait 60 seconds, and reinsert — this forces the dock to re-read pack voltage from scratch. If the fault persists, use a compatible Li-ion charger set to 7.4V to bring the pack above 7.0V, then return it to the dock.
After sitting unused for a few months, my HX400IS won't power on even though the battery shows it was charged when stored — is the pack dead?
Extended storage without a top-up charge allows Li-ion cells to self-discharge below BMS recovery voltage. When cell voltage drops under roughly 2.5V per cell, the BMS locks out to prevent damage and the radio shows no response at power-on. Place the pack in the dock — if the dock accepts it, a slow charge will recover the cells. If the dock shows no response at all, the pack has likely crossed the BMS lockout floor and will not recover; replace it and store the new pack at approximately 50% charge if it will sit unused again.
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