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? -
![battery charging - What is the right voltage to charge a flooded lead acid at CV? Also it got pretty warm while filling up acid - Electrical Engineering Stack Exchange battery charging - What is the right voltage to charge a flooded lead acid at CV? Also it got pretty warm while filling up acid - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/PuYBl.jpg)
battery charging - What is the right voltage to charge a flooded lead acid at CV? Also it got pretty warm while filling up acid - 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)
How to charge all lead acid batteries; how to charge SLA lead acid batteries, a tutorial for engineers about lead acid chargers and charging.
![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)
Calculating Proper Charge Settings for Rolls Flooded Lead-Acid Batteries : Rolls Battery Technical Support
![12 volt battery charge rate on vehicle - Yaris & Yaris Cross Club - Toyota Owners Club - Toyota Forum 12 volt battery charge rate on vehicle - Yaris & Yaris Cross Club - Toyota Owners Club - Toyota Forum](https://toyotaowners.b-cdn.net/uploads/monthly_2022_03/Battery-Chargers-2.jpg.0cc3336976900094b04afde6762521a9.jpg)