Battery Cost Per Amp-Hour Calculator

Compare 12V batteries by cost per usable amp-hour to make apples-to-apples buying decisions.

Common questions

What's a fair price per Ah for a gate opener battery?: Sealed lead-acid 12V batteries typically run $1.50–$3.00 per Ah at retail. AGM runs $3–$5. Lithium runs $8–$15 but lasts 3–5x longer.
Is a cheaper battery a worse deal?: Often yes when you factor cycle life. A $25 battery replaced yearly costs more than a $60 battery lasting 4 years.
How do I compare lithium vs lead-acid on cost?: Divide total cost by rated cycle count times usable Ah. Lithium usually wins over 3+ years despite the higher sticker price.