How Long Will it Take to Charge a LIFEPO4 240AMP Hour Battery with CTEK PRO25S Smart Battery Charger  

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Expert Reply:

Hello Jason,

The CTEK PRO25S Smart Battery Charger and Power Supply - AC to DC - 12V - 22 Amp # CT69FR is a great choice for your 240Ah LiFePO4 battery!

If you were charging from completely empty (0%), we’d divide 240 amp-hours by 22 amps, which gives us about 10.9 hours. But because charging slows down near the top, especially in the final “absorption” phase where the charger tapers off to avoid overcharging, we add a little buffer. That puts your total charge time at around 11 to 12 hours from 0% to full.

That said, you will never charge the battery from 0%. If you’re starting from, say, 20–30% (which is common and actually healthier for lithium batteries), you can expect around 8 to 9.5 hours to top off, totally doable for an overnight charge or between adventures.

The best part is the # CT69FR takes great care of your battery. It uses a multi-stage smart charging process that ensures everything stays safe and efficient, and it runs quietly since there’s no fan. Just double-check that your battery cables are rated for at least 22 amps, and you’re good to go.

What is this battery used for?

expert reply by: Kate F

0

Kate F.

9/2/2025

Hey Jason, How did the charging process go with your 240Ah LiFePO4 battery using the CTEK PRO25S charger? I'm curious about your experience because it could help others with similar charging needs.

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