How long should the battery of an iPhone 7 last? Approximately 10-12 hours depending on how you are using your phone. If you’re doing more audio playback and phone calls than internet browsing you can expect much longer. When you purchase a refurbished iPhone the battery has likely been slightly depleted but at Frank We guarantee our batteries retain a minimum of 80% of their original capacity (which Apple has declared sufficient for efficient battery performance).
Apple's lithium-ion batteries are designed to hold at least 80% of their original capacity for a high number of charge cycles, this will vary depending on the product.