How to Calculate Safe Vaping Wattages

Vaping safely isn’t just about juice or coils, it also depends on your battery limits. Using your battery too hard can cause overheating, damage, or worse. Luckily, figuring out safe wattage is simpler than most people realise.

Step 1: Know Your Battery Specs

Every battery has three important numbers:

• Nominal Voltage (V): Usually 3.6–3.7 V

• Maximum Voltage: Usually 4.2 V

• Continuous Discharge Rating (CDR): The most current your battery can safely deliver continuously

Example:

• Capacity: 3800mAh

• CDR: 10 A

• Nominal Voltage: 3.6 V

• Max Voltage: 4.2 V

Step 2: Calculate Max Wattage

Use this formula:

$$\text{Watts} = \text{Voltage} \times \text{Current (CDR)}$$

• Nominal voltage: 3.6 × 10 = 36 W

• Fully charged: 4.2 × 10 = 42 W

This tells you the maximum power your battery can handle.

Step 3: Keep a Safety Margin

• Regulated mods: Vape around 25–30 W

• Mechanical mods: Maximum ≈ 40 W, and coil resistance ≥ 0.42 Ω

Tip: Stay below the max to keep your battery safe and healthy.

Step 4: Some Examples

Higher capacity batteries usually handle less current, so they aren’t great for super high-wattage vaping.

See below for an easy example!