20 Best 3.7V 4000Mah Lithium Battery of 2023 – Romance University
After hours researching and comparing all models on the market, Romance University finds out the Best 3.7V 4000Mah Lithium Battery of 2023. Check our ranking below.
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- 【Model Type】: 18650 3.7 4400mAh battery With JST XH-2P/2.54 forward plug. plug size will show in our listing picture.
- 【SIZE】Size: 2.66*1.46*0.73 Inchs 【XH plug size】0.223x0.155Inchs, please don't cut the wire if the battery plug not correct, so we can full refund for u if return.
- 【KNOW BEFORE USE 1.】please contrast with the old battery and check the polarity of the battery. Red wire connection power positive " +" , Black wire connect power negative pole "-". if is a reversed, you need position of interchange wires. otherwise device will demage.
- 【POSITION OF INTERCHANGE WIRES】 --- If the polarity of the red and black wires are reversed, you need to exchange the position of the plug wires, You will need to take the wires out of the plastic plug and reverse them only. To do this, take the small blade you own, very gently pry up the two plastic tabs on the top of the plug one at a time, and gently pull the wire out of the plastic plug.( Don't yank!)
- 【KNOW BEFORE USE 2.】Please make sure your device's working current or power before purchasing, our battery is 16.28Wh 3.7V battery, Normal max Continue discharg current is 6A, max power 22.2Wh. For example use it for 24Wh Ortizen Portable Bluetooth Speaker IPX7, battery's drop voltage fast, it will stop work because of overdischarge protection when voltage below 2.5V. it shows your device work ,but battery discharge about 40 minutes .PLEASE DO NOT over its power ability . Our battery max Continue discharg current and max Instantaneous discharge current will list in below sepcification.
- MakerHawk adopts a brand-new A-grade lithium cobalt oxide battery system, which, compared to ternary system batteries, not only provides higher energy and higher density but also ensures more stable discharge performance and longer lifespan. It also complies with UN 38.3 standards certification, ensuring safety and reliability.
- Over-Discharge Protection: When the battery is about to deplete, and the voltage drops to 3.0V, the protection circuit will shut down, preventing further discharge and providing over-discharge protection.
- Over-Charge Protection: During battery charging, when the voltage reaches the maximum battery voltage (4.2V), the protection circuit will automatically cut off power, indicating that the battery is fully charged and providing over-charge protection.
- Short Circuit Protection: In the event of a short circuit, the protection circuit will automatically shut down within milliseconds and will not power on again. Note that if the battery is short-circuited (bypassing the protection circuit), the protection circuit may also fail due to prolonged high current or component overheating.
- Storage & Usage: During long-term storage, keep the battery charged between 40% and 60%. We recommend charging the battery once every 3 months after receiving it, maintaining a voltage of 3.7-4.0V. Store the battery in a cool, dry place.
- You Will Get: 1 x 2 slots smart battery wall charger set
- Charging Indicator: When the indicator is RED, it means charging; when it's GREEN, it means full charged; make sure you put the battery in position and it contacts with charger.
- Wide Compatibility: Battery charger tool compatible for high power devices, such as headlamp, flashlight, radio, cameras, doorbells, LED lights, solar lights, toys, small fans, RC car, headlights, etc.
- YOU WILL GET: 4 BUTTON TOP BATTERIES and Universal Charger
- 【Wide Compatibility】Compatible with flashlights,headlamps, doorbells, small fans, digital cameras, children's toys, radios, speakers, Camcorders. Helps you wake up your devices quickly.
- Package Includes: 2 pack button top batteries
- Widely Compatible: 3.7 volt 18650 rechargeable battery for flashlights, headlights, digital cameras, doorbells,toys, radios, speakers, Electronic Device. this 3.7v battery is highly portable, making it convenient for travel, camping trips
- Product Size: 67*18*18mm/2.63*0.7*0.7inch; it's a 3.7 volt rechargeable battery BUTTON TOP, please check carefully before purchasing
- Multiple Protections: This 3.7v 18650 battery features six types of protection, including temperature, short circuit, overcharge, and overcurrent protection. These features ensure the battery remains stable and your device stays protected at all times.Please fully charge the battery before the first use, the battery will work better. Charge up to 1000 times without frequent battery changes
Last update on 2025-07-02 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API
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