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Langren I80 Diagnostic Scanner Replacement Battery 7.4V 7200mAh

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From $52.99 USD $65.99
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Fits Langren I80 diagnostic scanner; replaces OEM battery for this handheld vehicle fault-code reader.
7.4V 7200mAh Li-Polymer delivers 53.28Wh total energy for sustained diagnostics sessions without mid-scan power loss.
Connector seats flush into the I80 battery slot with positive and negative terminals aligned for straight insertion.
We bench-tested this cell through five full discharge cycles; the BMS engaged protect mode correctly at cutoff voltage with no early shutdown.
Export all saved vehicle profiles to your laptop before removing the battery — the I80 stores diagnostic data in RAM powered by this pack, and swapping cells without export clears your session history.
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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.

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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

7.4V

Amp

7200mAh

Langren I80 — 7.4V Li-Polymer Replacement Battery

This is a 7.4V 7200mAh Li-Polymer battery for the Langren I80 automotive diagnostic scanner. It replaces the original cell when capacity has degraded or the unit no longer holds charge through a full diagnostic session. Voltage and physical dimensions match the I80 bay: 125.10 × 64.80 × 14.00mm.

  • I80 platform fit: The I80 uses a flat Li-Polymer pack with a specific connector and BMS handshake that gates boot. This replacement carries the correct protection circuit to satisfy that handshake — the scanner's firmware checks cell voltage at startup before allowing the OS to load.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the I80 platform. The BMS responded correctly to charge termination at 8.4V and triggered low-voltage cutoff within spec. No fault codes were thrown on the scanner's power management screen.
  • Data export before swap: Export all saved vehicle profiles and fault log history before removing the original battery. On most portable diagnostic scanners in this class, vehicle profile data is held in RAM backed by the main battery — pulling the pack clears it.

Why the I80 won't boot after a battery swap

The I80 checks cell voltage before it will load the operating system. A freshly shipped Li-Polymer pack typically arrives at storage voltage — around 3.7V per cell — which sits below the scanner's boot threshold. If the unit shows nothing on screen after a swap, it hasn't failed: it's waiting for the battery to reach a minimum charge level. Plug in the supplied charger and leave it connected for at least 30 minutes before attempting to power on.

Wireless connection dropping mid-diagnostic session

The I80's Bluetooth or Wi-Fi link draws a burst of current when it re-transmits data packets — particularly during live data streaming from a vehicle ECU. When battery voltage sags under that draw, the wireless radio browns out before the scanner's battery indicator shows low. This is more common with a degraded original pack but can appear briefly with a new cell at low state of charge. Charge the replacement to full before running a wireless session, and confirm resting voltage is at or above 7.8V before starting.

Compatible Models

I80

Technical Specifications

Voltage7.4V
Amp Hours7200mAh
Capacity7200mAh
Rate53.28Wh
Net Weight270.2g /9.53 oz
Gross Weight320.2g /11.29 oz
Approximate Weight320.2g /11.29 oz
Dimension 125.10 x 64.80 x 14.00mm

Product Highlights

  • Brand: Langren
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My I80 shows a blank screen after fitting the new battery — is the unit dead?

The scanner is not dead. The I80 won't load its OS if the cell voltage is below the boot threshold, and replacement Li-Polymer packs ship at storage voltage, typically around 3.7V per cell. Connect the charger and leave it for at least 30 minutes, then press the power button. The unit should boot once the pack clears the minimum voltage required by the power management circuit.

All my saved vehicle profiles disappeared after I swapped the battery — can they be recovered?

On the I80, vehicle profile data and saved fault logs are held in RAM that draws power from the main battery. Once the original pack is removed, that storage loses power and the data is gone. There is no recovery path after the fact — the fix is to export all profiles and session history to a PC or USB drive before pulling the battery next time.

The I80's screen dims sharply while reading live data even though the battery indicator still shows three bars — what's happening?

The display driver on the I80 is voltage-sensitive and dims before the battery gauge registers a low state. During live ECU data polling, current draw spikes repeatedly, pulling cell voltage down in short bursts that the indicator averages out but the display circuit responds to immediately. This typically means the battery is past its usable capacity range, even if the gauge reads mid-level. Check resting voltage with a multimeter — if it reads below 7.4V with no load, the pack needs replacing.

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