Help - Battery Voltage Calculator

Welcome to the Battery Voltage Calculator. This tool helps you estimate the remaining charge of various battery types based on their voltage.

How to Use:

1. Select your battery type from the dropdown menu.
2. Enter the measured voltage of your battery.
3. Click 'Calculate Charge' to see the estimated remaining charge.

Supported Battery Types:

• Alkaline (1.5V)
• Carbon-zinc (1.5V)
• Lithium-ion (3.7V)
• Lead Acid (12V)
• Deep Cycle (12V)
• NiMH (1.2V)
• 9V Alkaline

Lead Acid Battery Voltage Chart

For lead acid batteries, the voltage can indicate the state of charge as follows:

• 12.7V or higher: 100% charged
• 12.4V: 75% charged
• 12.2V: 50% charged
• 12.0V: 25% charged
• 11.9V or lower: Discharged

Lead Acid Battery Voltage Chart

Note: These values are approximate and may vary slightly depending on the specific battery and conditions.

For the most accurate results, always use a reliable voltmeter and ensure the battery has been at rest (not charging or discharging) for at least a few hours before measuring.