The LG INR18650 MJ1 3500mAh battery is a high-performance, rechargeable flat-top cell optimized for devices requiring stable power and long runtime. With a 10A continuous discharge rate and 3500mAh capacity, it balances energy density and safety, making it ideal for flashlights, vaping devices, and portable electronics. Its Li-NMC chemistry ensures low heat generation and extended cycle life.
How to Prevent Lithium-Ion Battery Fires and Explosions
What Are the Key Specifications of the LG MJ1 Battery?
The LG MJ1 features a nominal voltage of 3.6V, 3500mAh capacity, and 10A max continuous discharge. It uses lithium nickel manganese cobalt oxide (NMC) chemistry, operates between -20°C to 60°C, and supports up to 500 charge cycles with a 70% capacity retention. Its flat top design ensures compatibility with devices requiring unprotected cells.
| Parameter | Value |
|---|---|
| Diameter | 18.6mm |
| Height | 65.2mm |
| Weight | 48g |
| Energy Density | 255 Wh/kg |
How Does the LG MJ1 Compare to Samsung 35E or Panasonic NCR18650B?
While the Samsung 35E and Panasonic NCR18650B offer similar capacities (3500mAh), the MJ1 outperforms both in energy efficiency under high loads. The MJ1 maintains stable voltage above 3.2V at 10A, whereas competitors drop below 3V. However, the NCR18650B has a lower self-discharge rate (2%/month vs. MJ1’s 3%), making it better for low-drain applications.
| Model | Continuous Discharge | Cycle Life | Optimal Load |
|---|---|---|---|
| LG MJ1 | 10A | 500 cycles | 5-8A |
| Samsung 35E | 8A | 400 cycles | 3-6A |
| Panasonic NCR18650B | 6.8A | 600 cycles | 2-4A |
What Safety Features Does the LG MJ1 Include?
The MJ1 integrates a CID (Current Interrupt Device) to prevent overcurrent, PTC (Positive Temperature Coefficient) to limit overheating, and a venting mechanism for pressure release. Its stainless-steel casing resists physical damage, while the separator shutdown at 130°C halts thermal runaway. Always use a charger with overcharge protection to maximize safety.
Advanced safety protocols include a three-stage pressure release system. The CID activates at 150kPa to break the electrical connection during gas buildup, while the venting disc ruptures at 300kPa to prevent explosions. The PTC layer increases resistance by 400% when temperatures exceed 90°C, creating a self-limiting circuit. For applications requiring additional safeguards, consider pairing the MJ1 with a protection circuit module (PCM) that adds over-discharge and short-circuit protection. These features make it 23% safer than unprotected cells in drop tests conducted by independent labs.
How to Properly Charge and Maintain the LG MJ1 Battery?
Use a Li-ion charger set to 4.2V ±0.05V. Avoid draining below 2.5V to prevent capacity loss. Store at 3.6V–3.8V in cool, dry conditions. Recharge every 3 months if unused. Clean terminals with isopropyl alcohol to maintain conductivity. Never expose to temperatures above 60°C or puncture the battery casing.
Optimal charging practices involve using a 0.5C rate (1.75A) for longevity—fast charging at 1A reduces cycle life by 15% over 200 cycles. Store batteries in fireproof containers with non-conductive separators. For long-term storage (6+ months), discharge to 40% capacity and wrap terminals in electrical tape. Regular maintenance includes checking for wrapper tears monthly and using a multimeter to verify voltage stability (±0.05V variance is acceptable). Users in humid environments should apply dielectric grease to terminals to prevent oxidation.
“The MJ1 remains the gold standard for 18650s in the 10A class. Its cycle life outperforms competitors by 20% in our stress tests, especially when kept below 45°C. The flat top design is critical—it prevents accidental shorting in multi-cell configurations. Just ensure you’re buying from authorized sellers; we’ve seen a 37% counterfeit rate in 2023.”
— Dr. Elena Voss, Battery Technologies Institute
FAQ
- Can I Use the LG MJ1 in a Tesla Powerwall?
- No. Powerwalls use custom lithium-ion packs optimized for 400V systems. The MJ1’s 3.6V output and lack of built-in BMS make it incompatible.
- Does the MJ1 Work with USB-C Chargers?
- Only if using a USB-C to 18650 adapter with voltage regulation. Direct charging via USB-C ports risks overvoltage damage.
- Is the LG MJ1 Protected Against Overheating?
- It has basic CID/PTC safeguards but lacks full protection circuits. For risky applications, add a third-party PCB module ($1.50–$3).