LiPo Battery for Drones: How to Choose Size, C Rating, Charger and Shipping

The right LiPo battery for a drone is the one whose cell count matches the electronics, whose capacity and weight suit the frame, and whose connector matches the aircraft. Discharge rating and brand come after that. Buy the charger with the first batteries, and plan shipping from the watt-hour rating, not the mAh figure.

Drone battery and charger shortlist

Pick the battery row that matches your aircraft, then a charger that supports that chemistry and cell count. Quantities are a starting point for one aircraft.

Step 1: Read the label

A label such as "4S 1500mAh 50-100C" carries three numbers:

• 4S: four cells in series. A standard LiPo cell is 3.7 V nominal and 4.2 V full, so a 4S pack is 14.8 V nominal.
• 1500mAh: the capacity, 1.5 Ah.
• 50-100C: the discharge rating, continuous first and burst second.

The balance lead tells you the cell count when the label is worn: count its wires and subtract one. A 5-pin plug is a 4S pack, a 7-pin plug a 6S pack.

Step 2: Match cell count and connector to the drone

Cell count must match what the drone was built for. A 6S battery on a drone designed for 4S can damage the ESC and motors, even if the plug fits. On a 5-inch quad, 6S is now the usual choice for freestyle and racing, with 1,600–2,100KV motors; 4S needs motors of roughly 2,300–2,800KV.

Typical sizes to start from:

• 65 mm tiny whoop: 1S 280–380 mAh.
• 75 mm tiny whoop: 1S 450–680 mAh.
• 3-inch: 4S 650–1,000 mAh.
• 5-inch on 6S: 6S 1,000–1,500 mAh.
• 5-inch on 4S: around 1,500 mAh.

Connectors follow size: BT2.0 or A30 on 1S whoops, XT30 on 2S–4S micros, XT60 on 5-inch and larger FPV drones, XT90 and dedicated connectors such as AS150U on large industrial packs. Buy the connector the drone already has rather than relying on adapters.

Step 3: Balance capacity against weight

More capacity means more energy, but also more weight for the motors to carry, and a quad that feels slower to respond. On a 5-inch freestyle quad, a 1,500 mAh 6S pack is not automatically better than 1,200 mAh. Compare weights on the product pages before you order a batch:

• CNHL Speedy Pizza V2.0 6S 1200mAh: about 208 g.
• GEPRC Storm 6S 1400mAh: 226 g.
• GEPRC 1100mAh LiHV, 6S version: 136.6 g.

Watt-hours per kilogram is the fairest way to compare energy across packs: nominal voltage × capacity in Ah, divided by weight.

• GEPRC Storm 6S 1400mAh LiPo: 22.2 V × 1.4 Ah = 31.08 Wh; 31.08 ÷ 0.226 kg ≈ 138 Wh/kg.
• CNHL Long Range 6S 5000mAh Li-ion: 108 Wh at about 432 g ≈ 250 Wh/kg.
• Tattu Plus 1.0 12S 22000mAh smart battery: 976.8 Wh at 6,058 g ≈ 161 Wh/kg, including its battery management electronics and case.

Step 4: Read the C rating with caution

The C rating tells you how much current a pack can deliver in theory: maximum current = capacity in Ah × C rating. The CNHL Speedy Pizza V2.0 6S 1200mAh is rated 120C continuous and 240C burst, which works out to 1.2 × 120 = 144 A continuous and 288 A burst on paper.

C ratings are often exaggerated, and makers do not test them the same way. A pack with poor discharge performance sags hard when you punch the throttle, and the quad feels sluggish. Use the rating to compare packs within one brand, and rely on independent discharge tests and your own flight logs across brands.

A brief sag is normal. A pack can drop to about 3.3 V per cell during a hard punch and recover when you ease off; that does not mean it is empty.

Step 5: Choose LiPo, LiHV or Li-ion

• Standard LiPo: charges to 4.20 V per cell, strong discharge, widely available. The default for 3-inch and 5-inch FPV.
• LiHV: charges to 4.35 V per cell, but only on packs rated for it. A little more energy and punch, especially useful on 1S whoops; opinions differ on whether LiHV packs lose performance sooner.
• Li-ion (18650 or 21700 cells): more energy for the weight, but much lower current. Around 5C continuous against around 50C for a typical LiPo, so it suits efficient long-range cruising, not freestyle.

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Li-ion packs follow the cell's current limit, not the pack's capacity. Six cells in series deliver the current of one cell; a 2P pack doubles it. The GEPRC Storm 6S1P 4000mAh is rated 15C, or 4.0 × 15 = 60 A, and suits 6–7.5 inch long-range builds.

Step 6: Buy the right charger

Use a dedicated balance charger and set the battery type, cell count and current every time. Connect both the main lead and the balance lead so the charger can keep the cells level.

Charge at 1C unless the maker allows more: 1C in amps is the capacity in mAh divided by 1,000. A 1,400 mAh pack charges at 1.4 A and takes about an hour. GEPRC recommends 1C and allows up to 3C on its Storm LiPo packs; CNHL lists 5C maximum on its Speedy Pizza packs. Faster charging adds heat and stress.

Check that the charger has the power to do it. The ToolkitRC M4AC is rated 25 W: 25 W ÷ 16.8 V ≈ 1.5 A at the top of a 4S charge, so a 4S 1,550 mAh pack charges at just under 1C. The ISDT Q6 PRO delivers up to 300 W and 14 A and supports LiPo, LiHV and Li-ion from 1S to 6S, but needs a DC supply of 7–32 V.

For 1S whoops, use a dedicated multi-port 1S charger such as the ToolkitRC H1, which charges eight packs at up to 2 A each. For industrial smart batteries, use a charger the battery maker supports: Grepow's TA3000 covers 6–14S and the full Tattu Smart range, and the Tattu 3.0 14S pack allows up to 5C fast charging only on the specified Grepow chargers.

Charge safely:

• Never leave batteries charging unattended.
• Charge on a non-flammable surface, away from anything that burns.
• Let packs cool after flying before charging them.
• Never charge a damaged, swollen or unusually hot battery.
• Leave parallel charging boards until you are comfortable with normal balance charging.

Step 7: Land, store and retire packs

• Start landing at about 3.5–3.6 V per cell on standard LiPo. Repeatedly flying to 3.0 V shortens life and raises internal resistance. Where the pack maker sets a higher floor, follow it.
• Store at 3.80–3.85 V per cell if the pack will sit for more than about a week; most chargers have a storage mode. BETAFPV gives 3.8–3.9 V for its LAVA LiHV packs and says not to keep them fully charged for more than three days.
• Li-ion uses its own limits. GEPRC's Storm 6S1P 4000mAh charges to no more than 4.10 V per cell, may discharge to 3 V, stores at 3.4–3.7 V and should charge at 1C, never above 2C.
• Store packs somewhere cool and dry. LiPo bags slow a fire but do not contain one; a metal ammo box with its rubber seal removed is the better long-term store.
• Retire a pack that is swollen, punctured or dented, runs hot, has one cell that keeps drifting from the others, or has lost noticeable performance. Take it to a battery recycling point.

Air travel and commercial shipping

Every battery needs a watt-hour figure for transport. Many newer packs print it; otherwise multiply nominal voltage by capacity in Ah.

Carrying batteries on a flight

Under US rules, spare lithium-ion batteries go in carry-on baggage only, with terminals protected against short circuit. If the cabin bag is checked at the gate, take the batteries out and keep them with you.

• Up to 100 Wh per battery: allowed without airline approval. A 6S 1,400 mAh pack (31.08 Wh) is well inside this.
• 101–160 Wh: up to two spares per person, with airline approval. The CNHL Long Range 6S 5000mAh (108 Wh) falls here.
• Above 160 Wh, such as a 976.8 Wh 12S industrial pack: outside the passenger allowance. These packs travel as cargo.

Batteries carried for sale or distribution, including samples, are not allowed under the passenger rules, and airlines can set stricter limits.

Shipping batteries as cargo

Commercial air shipments fall under the IATA Dangerous Goods Regulations. Three cases matter for drone buyers:

• Batteries shipped on their own (UN 3480, Packing Instruction 965): no more than 30% state of charge, forbidden as cargo on passenger aircraft, and every package carries a Cargo Aircraft Only label. Packs above 100 Wh ship under Section IA, packs up to 100 Wh under Section IB.
• Batteries packed with the drone in the same box (UN 3481, Packing Instruction 966): from 1 January 2026, also no more than 30% state of charge. Under Section II this applies to batteries above 2.7 Wh, which covers nearly every drone pack except small 1S whoop batteries.
• Batteries installed in the drone (UN 3481, Packing Instruction 967): reduced charge is strongly recommended, at no more than 30% of rated capacity or 25% indicated capacity, but not mandatory.

Shipping above 30% charge needs approval from the authorities of the state of origin and the state of the operator. The manufacturer and every distributor after it must make the battery's UN 38.3 test summary available, so ask your supplier for it before ordering. A qualified dangerous-goods forwarder should confirm packaging, labels and documents for each shipment.

Common mistakes

• Buying by capacity before checking that the cell count matches the drone.
• Taking the C rating as a measured current.
• Charging a standard LiPo on a LiHV setting, or a Li-ion pack on LiPo settings.
• Ordering a box of batteries and no charger that can handle them.
• Leaving packs fully charged between sessions.
• Planning air shipments from mAh instead of watt-hours.

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