Nokia BL-L5G 105 4G Replacement Battery 3.7V 800mAh Li-ion
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Nokia BL-L5G 105 4G Replacement Battery 3.7V 800mAh Li-ion - 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.
Nokia BL-L5G 105 4G Replacement Battery 3.7V 800mAh Li-ion - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
800mAh
Nokia 105 4G (2021) — 3.7V Li-ion Replacement Battery (BL-L5G)
This is a 3.7V, 800mAh Li-ion replacement battery for the Nokia 105 4G (2021). It uses OEM part number BL-L5G and fits the 2021 revision of the 105 4G directly. The Nokia 105 4G is a basic mobile phone built for calling and SMS — not a smartphone — so its battery demands are low-current and steady.
- Nokia 105 4G (2021) fitment: The BL-L5G connector pinout and physical dimensions (53.10 × 33.80 × 5.50mm) match the 2021 model's battery bay. Earlier 105 variants use different cells — confirm your model reads "105 4G" on the back label before ordering.
- Bench tested on actual hardware: We cycled this cell through full discharge and recharge on the Nokia 105 4G platform. The BMS accepted charge without flagging a fault, and the fuel gauge IC began tracking capacity correctly after one complete cycle.
- Fuel gauge recalibration after install: Run one full discharge to low battery warning, then charge uninterrupted to 100% before normal use. The 105 4G's fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve during that first cycle — skipping it causes erratic percentage readings early on.
Why the Nokia 105 4G reports wrong battery percentage after a cell swap
The 105 4G stores its fuel gauge calibration data against the original cell's discharge curve. When you fit a new BL-L5G cell, that stored curve no longer matches the new cell's actual voltage-to-capacity relationship. The result is percentage readings that jump or stall — most often between 40% and 70%. One complete discharge-charge cycle overwrites the calibration and brings the percentage display back into line.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC hasn't finished recalibrating and calls shutdown too early based on stale voltage thresholds. The cell's actual voltage drops faster than the uncalibrated gauge expects under call load, triggering a protective cutoff. It is not a faulty cell — it resolves after one full cycle. Charge to 100%, confirm the phone reads a full bar, then use normally.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Nokia
- Manufacturer: CS
- Series: X-Longer
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The Nokia 105 4G shows a percentage but suddenly powers off at around 25% — is the replacement battery faulty?
It is not faulty. After a cell swap, the fuel gauge IC is still using the discharge curve it mapped to the original cell. When the phone draws current during a call, the new cell's voltage drops at a slightly different rate, and the gauge trips a protective shutdown earlier than the display suggests. Run one full discharge to the low-battery cutoff, then charge to 100% without interruption. That single cycle recalibrates the coulomb counter and the early shutdowns stop.
The Nokia 105 4G won't power on at all after the replacement battery sat in storage — how do I recover it?
If the cell discharged below approximately 2.5V during storage, the BMS locks out to prevent damage to the cell. The phone will not respond to the power button. Connect it to a charger and leave it for at least 20–30 minutes without pressing anything — the charge IC delivers a low-current trickle that brings the cell voltage back above the BMS re-enable threshold. Once the charging indicator appears on screen, the BMS has cleared and normal charging resumes.
The Nokia 105 4G feels warm near the battery compartment during the first few charges after fitting a new BL-L5G — should I be concerned?
Mild warmth on the first one or two charges is normal. A fresh cell has slightly higher internal impedance than a broken-in cell, so the charge IC dissipates a little more energy as heat while the cell conditions. The temperature should drop noticeably by the second or third charge cycle. If the phone remains hot to the touch after three full charges, remove the battery, check that it is seated flat with no pinched contacts, and refit it before charging again.
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