This is a DIY power charging module for lithium battery, this module is equipped with a 5V micro USB interface, can connect your USB charger to charge the rechargeable lithium battery directly as a phone charger. You can reserve the input voltage wire solder joint all the time, which is more convenient and easier for DIY. 1A charging current charging ensures safe use and protects you from hurting. Features - With micro USB port, connect your USB charger to charge the rechargeable lithium battery directly as a phone charger. - This module can charge single-cell lithium battery or multi-section parallelled lithium . - LED indicators makes it easily read the charging status. Red light is being charged, is fullly charged. - Can be used for voltage 3.6, 3.7V, etc. , polymer and other lithium battery charge and discharge protection. - You can reserve the input voltage wire solder joint all the time, which is more convenient and easier for DIY. 1A charging current charging ensures safe use and protects you from hurting. Specifications - Chipset: - Size: 25 x 19 x 6 mm - Input voltage: 4.5V-5.5V - Fully charged voltage: 4.2V - Charging current: 1A adjustable - Maximum charging current: 1000mA - Working temperature: -10 - 85degrees - Charging method: Linear charging 1% - Charging precision: 1.5% - Charging indicator: Red light charging, fully charged - Interface: Micro USB - Inversed polarity protection: NO NOTE: If you want to change the charging current, please see the below table for changing the charging current by changing the Rprog resistor) RPROG(k) - (mA) 30 - 50 20 - 70 10 - 130 5 - 250 4 - 300 3 - 400 2 - 580 1.66 - 690 1.5 - 780 1.33 - 900 1.2 - 1000 WARM TIPS: - Please make sure the battery is well connected. - Please do not connect the output reversely, otherwise it may burn the chip. - The connection wire should not be too thin or too long. - Current meter can only be connected with the module in series with 5V input. - Charging current is better to be 37% of the battery capacity. If you want to charge a battery of 1000mAh, 400mAh current will be enough. - High voltage protection, the current will be lower than 1000mAh when the voltage is higher than 5V. It subtracts the charging current automatically to avoid burn damage to chip. Package list: 5 x Lithium Module