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? -
![23 Relation between Charge Voltage, Charge Current, and State of Charge... | Download Scientific Diagram 23 Relation between Charge Voltage, Charge Current, and State of Charge... | Download Scientific Diagram](https://www.researchgate.net/publication/353260340/figure/fig5/AS:1045747222974482@1626336975423/Relation-between-Charge-Voltage-Charge-Current-and-State-of-Charge-of-Lead-Acid-Battery.png)
23 Relation between Charge Voltage, Charge Current, and State of Charge... | Download Scientific Diagram
![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
![How to charge all lead acid batteries; how to charge SLA lead acid batteries, a tutorial for engineers about lead acid chargers and charging. How to charge all lead acid batteries; how to charge SLA lead acid batteries, a tutorial for engineers about lead acid chargers and charging.](https://www.powerstream.com/z/bcc.png)