LGIP-A1700E Replacement Battery for LG AX390 3.7V 1700mAh
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LGIP-A1700E Replacement Battery for LG AX390 3.7V 1700mAh - 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.
LGIP-A1700E Replacement Battery for LG AX390 3.7V 1700mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1700mAh
LG AX390 — 3.7V Li-ion Replacement Battery (LGIP-A1700E)
This is a 3.7V, 1700mAh (6.29Wh) Li-ion replacement battery for the LG AX390 mobile phone. It replaces OEM part numbers LGIP-A1700E and SBPL0081101. Fit this battery when the original cell no longer holds a usable charge or the phone shuts down unexpectedly under load.
- AX390 platform fit: The AX390 uses a single-cell 3.7V Li-ion pack with a three-contact connector tied to a basic BMS handshake. The connector pinout and physical dimensions match the LGIP-A1700E footprint, so no modification is needed to seat the replacement.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the AX390 platform. The BMS accepted the cell on first insertion, charge termination triggered correctly at 4.2V, and voltage under modem load held stable without triggering the low-voltage cutoff prematurely.
- Fuel gauge recalibration on first use: After fitting this battery, disable fast charging and run one full discharge-to-charge cycle before returning to normal use. This gives the fuel gauge IC time to map the new cell's discharge curve — skipping this step is the main cause of erratic percentage readings in the first few days.
Why the AX390 reports wrong battery percentage after a cell swap
The AX390 uses a coulomb-counter-based fuel gauge IC that builds its capacity model from previous charge and discharge cycles. When a new cell goes in, the IC still references the old degraded cell's curve. The result is a percentage readout that does not match actual remaining charge — the phone may show 40% and cut out, or show full and drop fast. One complete discharge down to automatic shutdown, followed by a full charge to 4.2V, forces the IC to rebuild its model against the new cell.
Sudden shutdown at 20–30% on the replacement cell
This is a voltage cliff problem, not a capacity problem. When the modem transmits or the screen peaks in brightness, current draw spikes and the cell voltage dips sharply. If the fuel gauge IC is still calibrated to an old weak cell, it sets cutoff thresholds too high — the phone interprets the voltage sag as empty and shuts down. The fix is the same recalibration cycle: drain the battery fully until the phone powers off on its own, then charge uninterrupted to 100%. After one cycle, the IC resets its low-voltage floor to match the new cell's actual sag behaviour.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: LG
- 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 LG AX390 won't turn on at all after sitting in a drawer for months with this new battery installed — is the battery dead?
Most likely the BMS has entered lockout because the cell voltage dropped below 2.5V during storage. The protection circuit cuts output entirely at that threshold to prevent damage. Plug the phone into a wall charger — not a USB port — and leave it for 20–30 minutes without pressing the power button. Once the charger pushes the cell back above 2.8V, the BMS releases and the phone will boot normally.
The AX390 feels warm near the battery during the first few charges after fitting this replacement — is that normal?
It is expected on the first one or two cycles. A new cell has slightly higher internal impedance than a broken-in one, so the charge IC pushes more voltage across that resistance, generating mild heat. The warmth should drop noticeably after the second full charge cycle as the cell's impedance settles. If the phone becomes hot to the touch or the charger disconnects early, stop charging and check that the battery connector is fully seated.
The battery percentage on my AX390 keeps jumping — it was at 54%, then skipped to 38% in two minutes without heavy use.
The fuel gauge IC is still recalibrating to the new cell's discharge curve. It interpolates state-of-charge from historical data, and with a fresh cell that history is wrong. Run one complete discharge — use the phone normally until it powers off automatically — then charge it straight to 100% without interrupting the cycle. After that single full cycle the coulomb counter resets its reference points and the percentage readings stabilise.
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