I have an 8-year-old never used 12v 7.5 ah lead acid battery. I check its voltage it was 3.5 v. Should I charge it and use it or get a new one? -
![batteries - Charging Lead Acid battery using SMPS - unexpected voltage measured at battery - Electrical Engineering Stack Exchange batteries - Charging Lead Acid battery using SMPS - unexpected voltage measured at battery - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/RgBV8.png)
batteries - Charging Lead Acid battery using SMPS - unexpected voltage measured at battery - Electrical Engineering Stack Exchange
![Calculating Proper Charge Settings for Rolls Flooded Lead-Acid Batteries : Rolls Battery Technical Support Calculating Proper Charge Settings for Rolls Flooded Lead-Acid Batteries : Rolls Battery Technical Support](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/59925064/original/gN86MFlEWdi3nIB7Veuqi7sUiCg2R4bLIg.png?1624988338)