Features Adopted of high quality electronic components, and accuracy process, ensure for the durability. The module has short circuit protection and 0 volt battery activation With battery protection, the module has stable performance Suitable for kid toys car, digital cameras, solar charging and audio equipment .The module has USB power protection. Specification: Item Type: Charging Module 1-Cell(1S) Version: Input voltage : DC 4.5V-5.5V(Recommend DC 5V) Charging voltage about : 1.35V-1.7V Charging current about : 230mA-240mA 2-Cell(2S) Version: Input voltage : DC 4.5V-5.5V(Recommend DC 5V) Charging voltage about : 2.7V-3.4V Charging current about :230mA-240mA 3-Cell(3S) Version: Input voltage : DC 4.5V-5.5V(Recommend DC 5V) Charging voltage about : 4.05V-5.1V Charging current about : 230mA-240mA 4-Cell(4S) Version: Input voltage : DC 4.5V-5.5V(Recommend DC 5V) Battery Protection: Operating Ambient Temperature: -40℃ to +85℃ Charging process: If the battery pack connected to the battery pack is already greater than 1V, it indicates that the battery has passed the precharge threshold and can be quickly charged. Fast charging requires current to be controlled at 250mA. The fast charging process should periodically detect the battery voltage and charging current, and detect the battery voltage -v or 0△V, and jump to make up the charging. Package List: 2 x Charging Module Note: 1. The output voltage cannot be measured with a multimeter without a battery. But can be observed with an oscilloscope.2. If your battery is 1-3Cell, please choose a high current version: NIMHCRTA Package List 2 x Charging Module