Using this HappyModel charging board is easy. First, connect it to your charger with the XT60 + 4S balancing plug. Then, attach up to 4 1S batteries to the appropriate connectors. Make sure to always charge Lipos that are identical and have an equivalent discharge. If you're charging multiple batteries, insert the jumper cap to match the number of batteries you're using. For example, if you're charging 4 batteries, put the jumper cap in the '4' position. When it comes to maintenance, keep the board clean and dry. Check the connectors regularly to ensure they're in good condition. If you notice any issues, stop using the board and get it checked. With proper use and care, this charging board will serve you well for a long time.