LiitoKala Lii-40A 21700 Flat Top Battery – 4000mAh High-Drain Cell for Flashlights and Vapes
KSh 2,000
🔋 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.
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