Quick Answer
Picking the right FPV battery comes down to four things: cell count (voltage), capacity (mAh), C-rating (discharge rate), and weight. Match the cell count to your drone's motor and ESC setup, choose a capacity that balances flight time with agility, and make sure the C-rating can handle the amps your build pulls. If you are new to the hobby, our guide to essential FPV drone parts covers where batteries fit alongside motors, ESCs, and flight controllers.
Cell Count: The Most Important Specification
The "S" number tells you how many cells are wired in series. Each LiPo cell delivers 3.7V nominal, while LiHV cells hit 3.8V. A 4S battery runs at 14.8V, a 6S at 22.2V. Higher voltage means sharper throttle response and higher top speeds, but also heavier packs and more stress on ESCs.
For FPV batteries, the main options break down by drone class:
| Drone Class | Typical Battery | Connector |
|---|---|---|
| Tiny whoop (65-85mm) | 1S or 2S (300-450mAh) | BT2.0 or PH2.0 |
| 3-inch cinewhoop | 3S or 4S (450-850mAh) | XT30 |
| 5-inch freestyle/race | 6S (1000-1600mAh) | XT60 |
| Long-range / fixed wing | 4S to 8S (3000-6000mAh) | XT60 or XT90 |
6S has become the default for 5-inch builds in 2025 and 2026. Motors run more efficiently at lower RPM for the same power, and reduced current means thinner wires and less heat. If you are building a new 5-inch quad, go 6S.
Capacity and Weight: The Balancing Act
Capacity (measured in milliamp-hours) determines how long your drone stays in the air. A 1300mAh 6S pack on a 5-inch freestyle quad typically gives three to five minutes of aggressive flying. Step up to 1600mAh and you might gain a minute, but the quad feels heavier and less responsive.
The general rule: fly the smallest battery that gives you acceptable flight time. A lighter drone handles better and survives crashes more easily. For racing, pilots often use 1000mAh packs. For freestyle, 1300-1500mAh is the sweet spot.
Compact 3S packs like the BETAFPV LAVA II 3S LiHV battery suit smaller builds where every gram counts. The LAVA II series uses LiHV chemistry, charging to 4.35V per cell rather than 4.2V, giving a noticeable performance bump early in a flight.
C-Rating: What the Numbers Actually Mean
A battery labelled "1300mAh 100C" claims it can deliver 130A continuously. In practice, most manufacturers inflate these numbers. A genuine 100C pack from a reputable brand like TheFPV or CNHL will outperform a cheap 150C pack from an unknown brand.
A typical 5-inch 6S freestyle quad pulls 100-150A at full throttle. A 1300mAh 100C battery supplies 130A theoretically, which works for most flying but sags during sustained full-throttle punches. For aggressive freestyle, look at 120C or higher from proven brands.
LiPo vs LiHV
Standard LiPo cells charge to 4.2V per cell. LiHV cells charge to 4.35V, giving slightly more power at the start of a flight. The difference matters most on 1S and 2S builds. For larger 4S and 6S quads, standard LiPo is usually better value since the voltage advantage disappears halfway through a pack.
Connectors Matter
Match your connector to the current your build draws. BT2.0 for 1S whoops, XT30 for 2S-3S builds, XT60 for 4S and 6S quads, and XT90 for high-draw 8S setups. A connector that is too small for the current wastes power as heat and can melt.
Safety: Non-Negotiable
LiPo batteries require basic care. Charge them in a LiPo safety bag or fireproof container, never unattended. Store at around 3.8V per cell (storage charge). If a pack puffs, dents, or smells chemical, retire it immediately. Damaged LiPos can and do start fires.
For more on what goes wrong with batteries and how to spot trouble, see our guide on FPV battery problems: voltage sag, puffing, and brownouts.
What to Buy
- BETAFPV LAVA II 3S LiHV Battery — compact 3S power for small builds and cinewhoops
- TheFPV The Battery V3 (6S, 1100mAh) — lightweight option for 5-inch racing or freestyle
- CNHL Ultra Black 6S 1050mAh 150C — high discharge rate for aggressive flying
- TheFPV LiPo Safety Bag — charge and store your packs safely
Browse the full batteries and power systems collection for more options across all cell counts and capacities.
Frequently Asked Questions
Can I use a 6S battery on a 4S drone?
No. The voltage is too high and will destroy your ESCs and possibly your motors. Always match the cell count to what your flight controller and ESCs are rated for.
How long do FPV batteries last?
Most pilots get 150-300 charge cycles before replacing a pack. Internal resistance increases with age, causing more voltage sag and shorter flights.
Is a higher C-rating always better?
Not necessarily. A genuinely rated 100C pack from a good brand will perform as well as a dubiously rated 150C from a cheap one. Focus on brand reputation and real-world reviews rather than the printed number.