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B803 3000mAh 3.8V Li-Polymer replacement battery for 4G router and portable WiFi, front view on white background showing battery surface and connector cable
B803 3000mAh 3.8V replacement battery for 4G router portable WiFi, back view showing model number B803, capacity 3000mAh, and voltage 3.8V on spec label

B803 3000mAh 3.8V Li-Polymer Replacement Battery for 4G Router / Portable WiFi

Original price was: $10.99.Current price is: $8.99.

🔘 B803 3000mAh 3.8V | 🔋 Li-Polymer | 📱 Compatible with 4G Router / Portable WiFi

8 in stock

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SKU: B803 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
Ireland, Austria, Belgium, Poland, Denmark, Switzerland, Portugal, Norway, Slovakia, Spain, Hungary, Italy, Czech Republic, Luxembourg, Netherlands, Sweden, Cyprus$8.0018–30 days
Croatia, Finland, Lithuania, Latvia, Slovenia$8.0030–50 days
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.

🔋 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

✅ CE / RoHS / UN38.3 Certified

✅ 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.

Battery model: B803
Capacity: 3000mAh / 11.4Wh
Rated voltage: 3.8V
Charge limit voltage: 4.35V
Battery type: Li-Polymer
Compatible with: 4G Routers, Portable WiFi Hotspots, Mobile WiFi Devices
Package include: 1 x battery
Keep your portable WiFi device running longer with this B803 3000mAh replacement battery. Many 4G routers and mobile hotspots use this standard battery model. Whether you have a Huawei, ZTE, TP-Link, or other brand, if your device requires a B803 battery, this is the perfect replacement. Features high-density cells for stable output and reliable performance.
This Li-Polymer battery delivers 3000mAh capacity, providing hours of continuous internet sharing. Built with grade A cells and multi-layer safety protection against overcharge, over-discharge, and short circuits. CE, RoHS, and UN38.3 certified for safe transport and use.
Compatibility Note: Please check your original battery before ordering. The B803 battery is commonly used in 4G LTE routers, portable MiFi devices, and mobile hotspots from various brands. Remove your old battery and verify the model number B803 printed on the label. If your device uses a different battery model, please search for that specific model.
Battery Care Tips: Avoid full discharge — recharge when battery level drops below 20%. Do not expose to high temperatures or direct sunlight. New batteries require 3-5 full charge cycles to reach optimal capacity. If you notice swelling or overheating, stop use immediately.

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Frequently Asked Questions

The B803 battery for 4G router is compatible with many portable WiFi hotspots and 4G LTE routers that use the B803 battery model. Common brands include Huawei, ZTE, TP-Link, Alcatel, and Netgear. To confirm compatibility, remove your current battery and check if the model number printed on it is B803. This 3000mAh replacement battery for portable WiFi works as a direct replacement for the original. If your device uses a different model number (such as B804 or B802), this battery will not fit.

The B803 3000mAh 3.8V battery has a rated capacity of 3000mAh (11.4Wh) and a nominal voltage of 3.8V. Charge limit voltage is 4.35V. It is a Li-Polymer type battery built with grade A cells. This 3000mAh Li-Polymer battery for MiFi devices provides stable power output and is CE, RoHS, and UN38.3 certified. For best performance, use a compatible charger (5V USB charger typically works with the device's charging circuit).

Installing B803 battery in 4G router is simple. Most portable WiFi devices have a removable back cover. Turn off the device, open the battery compartment, remove the old battery, and insert the new B803 battery with the contacts aligned correctly. Close the cover and charge the device fully before first use. No tools are required. If your device has a sealed design (non-removable battery), professional installation is recommended. Always dispose of old batteries properly.

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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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