Inrico S380 B-81J Replacement Battery 3.8V 6200mAh
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Inrico S380 B-81J Replacement Battery 3.8V 6200mAh - 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.
Inrico S380 B-81J Replacement Battery 3.8V 6200mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.8V
Amp
6200mAh
Inrico S380 — 3.8V Li-ion Replacement Battery (B-81J)
This 3.8V, 6200mAh lithium-ion battery replaces the OEM B-81J pack in the Inrico S380 portable two-way radio. It fits the S380 directly and matches the original voltage rail and connector configuration. Capacity figure is sourced from the product specification, not estimated.
- S380 platform fit: The S380 runs a single-cell 3.8V architecture. This pack matches that voltage rail and carries the same BMS handshake the dock and radio expect on insertion — no adapter required.
- Bench tested on actual hardware: We cycled this pack through PTT transmit loads on the bench. The BMS held steady through repeated transmit bursts without tripping overcurrent cutoff, and the charger dock accepted the pack on first insertion.
- Contact strip seating on first insertion: If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The S380 dock requires a clean contact cycle to complete the BMS handshake before charging begins.
Why the S380 cuts out mid-transmission on a new B-81J pack
New lithium-ion cells ship at storage voltage — typically around 3.6V — not full charge. On the S380, a PTT transmit event draws a sharp current spike to power the RF output stage. If the cell hasn't completed its first full charge cycle, that spike can pull the voltage below the BMS cutoff threshold momentarily, dropping the transmission. Charge the pack fully in the dock before first use in a live shift. Once the cell is at rated voltage, the transmit spike stays well within the BMS operating window.
S380 showing one fewer signal bar than expected after swapping to a new pack
The S380 reads battery level through voltage thresholds, not a fuel gauge chip. A new cell at storage voltage will sit in a lower threshold band and display one bar fewer than expected — this is not a fault with the pack. Run the battery through one full charge cycle in the dock. Once the cell reaches 4.2V at full charge, the indicator will step up to the correct bar level and remain stable under normal load.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Inrico
- 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 S380 drops to reduced TX power partway through a shift — is the new pack causing this?
Yes, and it's a voltage sag issue, not a faulty pack. Under sustained RF output, the cell voltage dips under load — if the pack hasn't been fully conditioned through a complete charge cycle, that sag is more pronounced. Run two full charge-discharge cycles before relying on the pack in a full shift. After conditioning, resting voltage at full charge should sit at 4.2V and sag under transmit load will stay within normal operating range.
The charger dock fault LED won't clear after inserting the new B-81J pack — what's wrong?
This usually means the pack arrived below the dock's acceptance voltage threshold. Some charger docks will not initiate charging if the cell voltage is too low on first insertion. Remove the pack, wait 30 seconds, and reinsert — some docks require a second contact cycle to attempt a trickle charge recovery. If the LED clears and charging begins, leave the pack on a full charge cycle before use. If the dock shows fault LED consistently, check that the gold contact strip is clean and making firm contact.
The S380 pack won't recover after sitting unused for several months — how do I fix it?
Extended storage lets lithium-ion cells self-discharge below the BMS recovery threshold, which can cause the BMS to lock out the pack entirely. Insert the pack into the dock and watch for any indicator activity in the first two minutes — even a brief blink means the dock is attempting a low-current recovery charge. Leave it connected for at least four hours without interruption. If the dock shows no response at all, check cell voltage across the contacts — a reading below 3.0V means the cell has discharged past safe recovery and the pack should be replaced.
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