Sale!
501855 2000mAh 11.1V 3S 25C Li-Po battery for RC drone, front view showing battery body, SM-2P discharge plug, and XH2.54-4P balance charge plug on white background, replaces 401855
501855 2000mAh 11.1V 3S 25C Li-Po battery front and back view combined, showing battery body on left and spec label with capacity, voltage, 25C rating on right for RC drone replacement 401855
501855 2000mAh 11.1V 3S 25C Li-Po battery dimension drawing showing length 62mm, width 18mm, height 15mm, cable length approx. 45mm, for RC drone battery compartment fitment check, replaces 401855

501855 2000mAh 11.1V 3S 25C Li-Po Battery with SM-2P and XH2.54-4P for RC Drone Toys (Replace 401855)

Original price was: $24.99.Current price is: $19.99.

🔘 501855 2000mAh 11.1V 25C | 🔋 3S Li-Po | 🔌 SM-2P + XH2.54-4P | 🚁 For RC Drone (Replace 401855)

8 in stock

No PayPal account? 💳 Pay with credit/debit card | 🛡️ PayPal Buyer Protected
SKU: 501855-2000mAh-11.1V Category: Tags: , , , ,
📦 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, Cyprus, Czech Republic, Denmark, Estonia, Hungary, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland$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.

🔋 Can't find your battery model? Use our FREE Battery Lookup Service – tell us your device and we'll find a match within 24 hours. 👉 battery.qingsm.tech/find-my-battery

Description

✅ Condition: Brand New – Never used, factory-tested quality

✅ 3S 11.1V 2000mAh 25C – High-performance power

✅ SM-2P + XH2.54-4P – Discharge + balance charge plugs

✅ Replaces 401855 – Direct drop-in replacement

✅ CE / RoHS / UN38.3 Certified

✅ 90-Day Warranty

✅ 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.

Battery model: 501855 (Replaces 401855)
Capacity: 2000mAh
Rated voltage: 11.1V (3S Li-Po, 3 cells in series)
Charge limit voltage: 12.6V (4.2V per cell)
Discharge rate: 25C
Battery type: Li-Polymer
Cell configuration: 3S1P (3 cells in series)
Discharge plug: SM-2P (2-pin SM connector)
Balance charge plug: XH2.54-4P (4-pin balance connector)
Dimensions: 62 × 18 × 15mm
Cable length (including plugs): approx. 45mm
Compatible with: RC drones, FPV quadcopters, electric toys, and 3S Li-Po devices
Package include: 1 x battery
Power up your RC drone or FPV quadcopter with this 501855 2000mAh 11.1V 3S 25C Li-Po battery. Designed as a direct replacement for the older 401855 model, this 3-cell pack delivers higher capacity and improved discharge performance. The 25C discharge rate provides the burst power needed for aggressive flight, flips, and responsive controls. The compact 62×18×15mm size fits most 3S battery compartments. Features a dual‑plug design: SM-2P for discharge and XH2.54-4P for balance charging. Built with grade A cells and multi-layer safety protection against overcharge, over-discharge, and short circuits. CE, RoHS, and UN38.3 certified.
501855 vs 401855 Upgrade: The 501855 is an upgraded replacement for the 401855 model, offering the same compact dimensions with improved cell quality and consistent 25C discharge performance. This is a direct fit for devices originally using 401855 battery packs.
Dual Plug Design Note: This battery includes both a discharge plug (SM-2P) and a balance charge plug (XH2.54-4P). The SM-2P connector powers your drone. The XH2.54-4P connector is for balance charging with a compatible 3S Li-Po charger — this ensures all three cells charge evenly for maximum lifespan.
Charging Instructions: Use only a balance charger designed for 3S (11.1V) Li-Po batteries. Set charger to Li-Po mode with 3S selected — full charge voltage is 12.6V. Recommended charge current: 2.0A (1C). Connect both the SM-2P and XH2.54-4P plugs during charging. Never leave the battery unattended while charging. Do not discharge below 9.0V (3.0V per cell).
Battery Care Tips: Avoid over-discharge — land your drone when you notice reduced power. Always balance charge for maximum battery life. Allow the battery to cool before recharging. Store at 40-60% charge at room temperature. If the battery swells or becomes hot, stop use immediately and recycle properly.

Discover more from Battery.qingsm.tech

Subscribe to get the latest posts sent to your email.

Reviews

There are no reviews yet.

Be the first to review “501855 2000mAh 11.1V 3S 25C Li-Po Battery with SM-2P and XH2.54-4P for RC Drone Toys (Replace 401855)”

Your email address will not be published. Required fields are marked *
To receive the "Verified Owner" badge, please use the same email address you used when placing your order.

Frequently Asked Questions

The 501855 is an upgraded replacement for the older 401855 battery model. Both have the same compact dimensions (62×18×15mm) and dual‑plug design (SM-2P for discharge, XH2.54-4P for balance charging). The 501855 offers 2000mAh capacity with consistent 25C discharge performance. This is a direct drop‑in replacement — if your device originally used a 401855, the 501855 will fit perfectly. For reference, similar 3S 2000mAh batteries on AliExpress sell for $10-16, while Amazon lists them for $15-22.

Use only a balance charger designed for 3S (11.1V) Li-Po batteries. Set charger to Li-Po mode with 3S selected — full charge voltage is 12.6V (4.2V per cell). Recommended charge current: 2.0A (1C). IMPORTANT: Connect BOTH plugs to the charger:
- SM-2P (2-pin): Main discharge/power connector
- XH2.54-4P (4-pin): Balance connector

Never charge without connecting the balance plug — this may cause cell imbalance, overheating, or battery damage. Never leave the battery unattended while charging. Do not discharge below 9.0V (3.0V per cell).

For maximum lifespan (up to 300-500 cycles):
1. Always balance charge using both SM-2P and XH2.54-4P plugs
2. Do not discharge below 9.0V (3.0V per cell) — land your drone when power drops
3. Store at 3.8V per cell (11.4V total) at room temperature
4. Allow the battery to cool before recharging after use
5. Never leave the battery unattended while charging
6. Avoid physical damage to the soft pack
7. If the battery swells, becomes hot, or shows damage, stop use immediately

The 25C discharge rate provides good power without excessive stress. For longer storage (over 7 days), keep at 40-60% charge.

Related products

✅ Ready to order?

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

👉 Add to Cart Now