# FPV LiPo Battery C-Rating and mAh Guide: How to Choose the Right Pack
Choosing the right LiPo battery is one of the most impactful decisions in an FPV drone build. Get it wrong, and you’ll either sag under throttle, puff your packs, or carry dead weight. This guide breaks down C-rating, capacity (mAh), cell count, and real-world selection strategy.
## LiPo Basics: What Do the Numbers Mean?
A battery labeled **”6S 1300mAh 100C”** contains three critical specs:
| Spec | Meaning | Example |
|——|———|———|
| **6S** | Cell count (6 cells in series) | 6 × 3.7V nominal = 22.2V |
| **1300mAh** | Capacity (milliamp-hours) | Can deliver 1.3A for 1 hour theoretically |
| **100C** | Discharge rating (continuous) | 100 × 1.3Ah = 130A theoretical continuous current |
## Cell Count (Voltage): Match Your Motors and ESCs
Your cell count is determined by your motor KV and ESC rating:
| Cell Count | Nominal Voltage | Typical Build | Motor KV Range |
|————|—————-|—————|—————–|
| 4S | 14.8V | Lightweight 3-4 inch, beginner 5-inch | 2300-2750KV |
| 6S | 22.2V | Modern 5-inch freestyle/racing | 1700-1950KV |
| 8S | 29.6V | High-power 7+ inch, X-Class | 1000-1350KV |
**The golden rule**: Higher voltage = lower current for the same power output. A 6S setup pulls fewer amps than 4S for the same thrust, meaning less voltage sag and cooler electronics.
## Capacity (mAh): Flight Time vs Weight Trade-off
More mAh means more flight time — but also more weight:
| Capacity | Typical Flight Time | Best For |
|———-|———————|———-|
| 850-1050mAh (6S) | 2.5-4 minutes | Racing, ultralight freestyle |
| 1100-1300mAh (6S) | 3.5-6 minutes | General freestyle (sweet spot) |
| 1400-1550mAh (6S) | 5-8 minutes | Cinematic cruising, medium range |
| 1800-2200mAh (6S) | 8-15 minutes | Long range, 7-inch builds |
**The weight penalty**: Every 50g of extra battery weight costs roughly 10-15 seconds of flight time in a 5-inch build. There’s a point of diminishing returns where a bigger battery actually reduces flight time due to the extra weight it carries.
## C-Rating: The Truth About Discharge Ratings
**Here’s what most people get wrong**: There is no industry standard for C-rating testing. A “100C” battery from one brand may perform worse than a “75C” from another.
### Real-World C-Ratings You Can Trust
| Brand | Advertised C | Real-World Continuous C | Notes |
|——-|————-|————————|——-|
| CNHL Black Series | 100C | ~45-50C | Good value, consistent |
| Tattu R-Line V5 | 140C | ~60-65C | Premium, low sag |
| GNB 110C | 110C | ~50-55C | Lightweight, good for racers |
| Ovonic 100C | 100C | ~40-45C | Budget option |
**Rule of thumb**: Divide the advertised C-rating by 2 to estimate real continuous performance. Batteries above 30C real rating are fine for most flying.
### How to Calculate If a Battery Can Handle Your Build
“`
Required C-Rating = (Motor Max Current × 4) ÷ Battery Capacity in Ah
“`
**Example**: A 5-inch build pulling 40A per motor at full throttle:
– Total draw: 40A × 4 = 160A
– With a 1300mAh pack (1.3Ah): 160 ÷ 1.3 = **123C burst required**
This exceeds most batteries’ continuous rating — which is why full-throttle punch-outs should be short!
## LiPo Care Tips for Long Life
| Practice | Why |
|———-|—–|
| Storage charge to 3.80-3.85V/cell | Prevents IR growth and puffing |
| Never discharge below 3.5V/cell under load | Permanent damage threshold |
| Land at 3.5-3.6V resting (recovery) voltage | Leaves safe margin |
| Let packs cool before recharging | Heat + charging accelerates degradation |
| Parallel charge only at 1C | Higher rates reduce lifespan |
| Dispose of puffed packs safely | Fire risk — discharge and recycle |
## Recommended LiPo Batteries
For the best balance of performance, weight, and longevity, the **Tattu R-Line V5 1300mAh 6S 140C** is the gold standard for 5-inch freestyle builds. Available at [uavmodel.com](https://uavmodel.com).
## Video Guide: LiPo C-Rating and Selection
## Quick Selection Cheat Sheet
| Build Type | Recommended Battery | Expected Flight Time |
|————|———————|———————|
| 5-inch Freestyle | 6S 1300mAh 100C+ | 4-6 minutes |
| 5-inch Racing | 6S 1050mAh 120C+ | 2.5-3.5 minutes |
| Cinematic 5-inch | 6S 1550mAh 100C+ | 6-9 minutes |
| 3.5-inch Micro | 4S 850mAh 75C+ | 4-7 minutes |
| 7-inch Long Range | 6S 2200mAh Li-Ion or 1800mAh LiPo | 10-15+ minutes |
Understanding C-rating and capacity helps you avoid the frustration of voltage sag mid-flight and the danger of puffed packs. Choose wisely, fly safely.