ROSbot 3 is an affordable robot platform for rapid development of autonomous robots. It can be a base for custom service robots, inspection robots and robots working in swarms. All versions integrate:Starting from August 31, 2023 ROSbot 2 (a.k.a. 2.0 / 2.1) will go end-of-life. As of this date, new features won’t be developed for ROSbot 2 and we will no longer be providing support for this model. More information in the announcement.You can also test the performance of ROSbot using our simulation model in Gazebo environment. It is available here, at our GitHub page.L1 is a status indicator driven by the firmware. L2 and L3 are user-programmable through the /leds topic (std_msgs/msg/UInt8), where each bit controls one LED: bit 0 (value 1) → L2, bit 1 (value 2) → L3.ROSbot is powered from an internal, rechargeable Li-Ion battery pack that contains 3 Li-Ion cells, connected in series. This type of connection is called “3S”. The schematic below explains how the cells are wired together and with the charging connector (on ROSbot side).The BAT+ and BAT- are the power connections and the “bal Bxx” wires are used to monitor the voltage on each cell. It is strongly recommended to keep equal voltages on each cell during the charging process. The charger included with ROSbot can charge batteries in the described way and, thanks to that, the long life of the battery set is possible.The nominal voltage of each cell is 3.7V but the useful range is 3.2V to 4.2V.Please make sure that the user firmware always contains the function that monitors the supply voltage level. Deep discharging of batteries may decrease their lifecycle. Discharging to the voltage lower than 3.0V/cell can also trigger the over discharge protection. If the voltage is too low, turn ROSbot off and charge batteries as soon as possible.The ROSbot kit contains the Redox Beta charger. It is an universal charger, suitable for charging NiCd, NiMH, Li-Po, Li-Fe, Li-Ion and Pb (AGM, VRLA) batteries. ROSbot shall be charged using an included charger and cable.Press [Start] - the current value should start blinking. Use arrows to set the current to 1.5A.Press [Start] again - the voltage value should start blinking. Select “11.1V(3S)” using arrows. The picture below shows the desired result.Press and hold [Start] for 2 seconds. The charger should now ask for confirmation. Press [Start] again. The charging process should begin now.