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902540 850mAh 3.7V 25C Li-Polymer high-capacity battery with JST connector (red wires) for Syma X5 X5C drone, front view showing battery label
902540 850mAh 3.7V 25C Li-Polymer high-capacity battery with XH2.54 connector (white wires) for Syma X5 X5C drone, front view showing battery label

902540 850mAh 3.7V 25C Li-Polymer Battery with JST/XH2.54 Plug for Syma X5 X5C X5SW RC Drone

Price range: $9.99 through $12.99

🔘 902540 850mAh 3.7V 25C | 🔋 Li-Polymer | 📱 Compatible with Syma X5 X5C X5SW RC Drone (JST / XH2.54)

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📦 Shipping, Warranty & After-Sales Information (Click to expand ▼)

✅ Why Our Warranty Stands Out

Unlike marketplace sellers with short buyer protection windows, we handle claims directly — no automated disputes, no endless back-and-forth.

Compare✅ Qingsm Tech⚠️ eBay / AliExpress
Warranty Period90 days from delivery15-30 days from order confirmation
When It Starts📦 Upon delivery⚠️ Upon order confirmation (even before you receive it)
Claims HandlingWe do it directly — email usAutomated dispute system, seller dependent
After Window ExpiresStill can contact us for supportNo recourse, seller can ignore you

🔋 90-day warranty is the industry standard for replacement batteries. Batteries naturally lose capacity over time — this normal wear is not covered. Warranty applies to manufacturing defects only.

📦 Shipping Cost & Delivery Time (Economy Shipping from China)

📦 Note: Batteries are classified as hazardous goods and must be shipped via specialized channels, which may take slightly longer than standard couriers. Delivery times are estimates and may be affected by customs, weather, or other unforeseen circumstances. If your country is not listed in the table below, we are currently unable to ship batteries to that destination.

DestinationFreight (USD)Est. Delivery Time
United States$7.808–15 days
Canada$6.8018–30 days
Mexico$10.0030–60 days
Germany, France, United Kingdom, Greece$6.5018–30 days
Austria, Belgium, Czech Republic, Denmark, Estonia, Hungary, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland, Ukraine$8.0018–30 days
Croatia, Finland, Lithuania, Latvia, Slovenia$8.0030–50 days
Bulgaria, Romania$14.0030–50 days
South Korea, Japan, Australia, New Zealand, Israel, Malaysia, Singapore, Thailand, Philippines, Kazakhstan$7.5018–30 days
United Arab Emirates, Saudi Arabia, Vietnam, Chile, Peru, Colombia, Brazil$18.0025–60 days

🇧🇷 Note for Brazil: Brazilian customs can occasionally cause delays of up to 80 days or more. And please indicate the recipient's CPF, as it is required for Brazilian customs and shipping. Thanks! We appreciate your understanding.

🇪🇺 Note for EU countries: Due to new EU customs regulations effective July 1, 2026, a flat tariff fee of $4.00 (approx. €3.50) applies to shipments to EU countries. This fee covers customs tariff, handling, and payment processing costs, and will be added at checkout. Thank you for your understanding.

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Description

✅ Condition: New – Factory-tested quality & Warranty

✅ 850mAh High Capacity – 25C high discharge rate for acrobatic flight

✅ Grade A Li-Polymer Cells – Genuine 850mAh capacity

✅ CE / RoHS / UN38.3 Certified – Meets international safety standards

✅ Built‑in Overcharge / Over‑discharge / Short Circuit Protection

✅ 90‑Day Warranty from delivery – Longer coverage than major platforms

✅ Ships in 3‑7 days with tracking

🛡️ Shipping Protection Available at Checkout

✅ PayPal Buyer Protection included

⚠️ Low Stock Alert: Only 8 left in stock. Order now to avoid waiting.

Package content: 1 x battery
Battery model: 902540
Capacity: 850mAh (Typical) / 800mAh (Rated) – 3.145Wh
Rated voltage: 3.7V
Charge limit voltage: 4.2V
Max continuous discharge current: 21.25A (25C rate)
Battery type: Li-Polymer (High-rate 25C)
Cycle life: 500+ cycles retains ≥80% capacity
Dimensions: 42 x 25 x 9mm | 1.65 x 0.98 x 0.35 inches
Weight: 17.5g
Connector options: JST connector (red wires) OR XH2.54 connector (white wires) — choose your version when ordering
Compatible with: Syma X5, X5C, X5S, X5SC, X5HC, X5HW, X5SW, X5UW, M68, X300, X400, MJX X400, and other 3.7V micro RC drones
Extend your flight time with this high-capacity 902540 850mAh 25C Li-Polymer battery. Designed for Syma X5 series drones (X5, X5C, X5SW, X5SC, X5HW, X5HC), this battery delivers a solid 25C discharge rate — providing ample power for 360° flips, rapid climbs, and stable hover. The higher 850mAh capacity offers approximately 8‑10 minutes of flight time per charge (depending on drone weight and flying conditions), outperforming standard 600‑720mAh batteries.
Built with Grade A Li-Polymer cells and equipped with overcharge, over‑discharge, short circuit, and overcurrent protection. CE, RoHS, and UN38.3 certified for safe use. For reference, third‑party retailers sell similar high‑capacity batteries for approximately $9 to $15.
⚠️ Important Safety Warning (LiPo Battery): Only use a dedicated LiPo balance charger set to 1S (3.7V) with charge current ≤850mA (1C max). Never leave charging unattended. Use a fireproof LiPo charging bag. The battery has no water resistance rating — avoid flying in rain or over water to prevent short circuits. Discontinue use immediately if swelling is observed.
⚠️ Connector Selection: This battery is available with TWO different connector types — JST (red wires) OR XH2.54 (white wires). Please select the correct version matching your drone’s original battery connector. If uncertain, check your original battery plug color: red plug typically indicates JST (Molex) style, white plug typically indicates XH2.54 style.
Battery Care Tips: Avoid full discharge — land your drone before voltage drops below 3.2V. Do not expose to high temperatures or direct sunlight. New batteries require 3‑5 full charge cycles to reach optimal capacity. For long‑term storage, keep at 40%‑60% charge (around 3.7‑3.8V) in a cool, dry place and recharge to storage level every 3 months. If swelling or physical damage is observed, stop use immediately and dispose of properly at a battery recycling center.

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Additional information

Connector type

JST, XH2.54

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Frequently Asked Questions

The 902540 850mAh battery for Syma X5 series is compatible with Syma X5, X5C, X5S, X5SC, X5HC, X5HW, X5SW, X5UW, M68, X300, X400, MJX X400, and other micro RC drones using a 1S 3.7V battery with 850mAh capacity. The Syma X5C features 6‑axis gyro stabilization, 360° flips, and 2.4GHz remote control. This high‑capacity battery provides longer flight times (8‑10 minutes) compared to standard 600‑720mAh batteries. If your drone requires a 25C or higher discharge rate for full‑throttle performance, this is the correct battery. Please verify your drone's battery connector type (JST or XH2.54) before ordering — this battery is available in both versions.

The 902540 850mAh 3.7V 25C Li-Po battery has a typical capacity of 850mAh (3.145Wh) and nominal voltage of 3.7V. Charging limit voltage is 4.2V. The 25C rating means the battery can safely deliver up to 21.25A (850mA × 25) peak current — essential for powering quadcopter motors during flips and climbs. For optimal safety and lifespan, charge at ≤1C (≤850mA) using a dedicated 1S Li‑Po balance charger. Never exceed 4.2V during charging. Operating temperature range: charge 0‑45°C, discharge -10‑60°C. The battery has a cycle life of 500+ full charge cycles when properly maintained. It features overcharge, over‑discharge, and short circuit protection. This battery meets CE, RoHS, and UN38.3 safety certifications.

To choose the correct connector version for your drone, check the plug on your original battery or the drone's battery socket. JST connectors typically have red wires and a larger red plastic plug — this is the most common type for Syma X5C original batteries. XH2.54 connectors typically have white or black wires with a smaller white plug — commonly found on newer Syma models and aftermarket upgrades. If uncertain, compare the plug shape: JST has rounded corners, while XH2.54 has square corners. This battery is available in BOTH versions — simply select the correct option when ordering. If your original battery plug is different from both, you may need to cut and solder the connector from your old battery to the new wires (red to red, black to black) using heat shrink insulation.

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This battery is in stock and ready to ship within 3-7 days. 90-day warranty included.

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