LiitoKala Lii-40A 21700 Battery – 4000mAh 40A High Drain, Flat Top, Unprotected for Vapes, Flashlights, Power Tools

�� LiitoKala Lii-40A 21700 4000mAh Flat Top Battery – High Drain, Vape-Compatible, Unprotected Cell for High-Power Devices Looking for a powerful 21700 battery that fits your vape, high-lumen flashlight, or DIY project? The LiitoKala Lii-40A is a flat-top, unprotected 21700 Li-ion battery with 40A high-drain output, built for serious performance. LiitoKala is one of the most reliable battery brands in the power industry. Well-known among flashlight enthusiasts, it's trusted for real capacity, long life, and strong, stable output—perfect for power-hungry devices. Because this battery is unprotected and has a flat top, it fits most vape pens and mods, especially those that reject longer protected cells. It's also ideal for high-drain devices like flashlights over 2000 lumens, power tools, e-bikes, or any product that demands quick, heavy discharge. ⚠️ Caution: This battery has no internal protection circuit. Always use a smart charger and do not leave it charging overnight. ✅ Key Features �� 4000mAh Real Capacity – Provides long runtime for flashlights and vapes. �� Flat Top, Unprotected Cell – Fits devices that require short-length batteries like many vape mods. ⚡ 40A Max Discharge Rate – Supports high-drain devices like LED torches, tools, e-scooters, and solar setups. ��️ Trusted by Enthusiasts – Flashlight lovers worldwide rate LiitoKala for reliability and performance. �� 1000 Charge Cycles – Built to last through years of use. �� Eco Budget Friendly – Rechargeable and long-lasting to reduce waste and save money. �� Best Uses For This Battery �� Vape pens & mods (requires unprotected, flat-top battery) �� High-lumen LED flashlights (Convoy, Sofirn, Wuben, etc.) �� Electric scooters and bikes �� Solar power storage or solar WiFi cameras �� DIY electronics or backup battery packs �� Power tools and home gadgets �� Specifications Feature Details Battery Type 21700 Li-ion Model LiitoKala Lii-40A Capacity 4000mAh Voltage 3.7V (Charge to 4.2V) Discharge Cut-off 2.5V Max Discharge Rate 40A Top Type Flat Top, Unprotected Size 21mm (D) x 70mm (L) Weight ~65g Internal Resistance <30 milliohms Recharge Cycles 1000 Charging Temp 0°C ~ 45°C Discharging Temp -20°C ~ 60°C ⚠️ Safety Tips ❌ Do NOT leave charging overnight – this is an unprotected battery. ✅ Use a smart Li-ion charger with auto cut-off. �� Always monitor the battery while charging. �� Store in a cool, dry place away from flammable items. �� Frequently Asked Questions Q: Will this battery fit in my vape?A: Yes. The flat-top, unprotected design fits most vape mods that don’t accept longer, protected cells. Q: Is this a high-drain battery?A: Yes, with a 40A continuous discharge rate, it's suitable for high-drain gear like flashlights over 2000 lumens, power tools, and other demanding devices. Q: Is it really 4000mAh?A: Yes, LiitoKala is respected for accurate labeling—unlike many fake brands that claim 9800mAh but don’t perform. Q: What’s the difference between protected and unprotected?A: This battery has no internal safety chip. Protected batteries have a built-in circuit to stop overcharging or discharging. This one gives more power, but needs careful use. Q: Can I use this in flashlights like Convoy M21 or Sofirn SP35?A: Absolutely. It fits most 21700 flashlights, especially those that need flat-top cells.