iPhone Duo battery life results are in — here's how it compares to other foldables (and iPhone 18 Pro Max)

The iPhone Duo's battery life is average compared to its competitors, but it should suffice for a day without needing a charger. It didn't make it to the top of our best phone battery life list, but it's still a decent option. Those looking for exceptional battery life are better off with the non-folding iPhone 18 Pro Max. Though, foldables are generally less efficient, and the iPhone Duo and the Samsung Galaxy Z Fold 8, as well as the Motorola Razr Fold and the Google Pixel 11 Pro Fold, fall short of the iPhone 18 Pro Max.

The Duo has a 13-hour and 20-minute battery life, while the Z Fold 8 lasts 10 hours and 6 minutes, and the Razr Fold extends to 14 hours and 44 minutes. The Pixel 11 Pro Fold, on the other hand, lasts 12 hours and 31 minutes. Charging speeds also vary among these devices; the iPhone Duo and the iPhone 18 Pro Max share the same 60W charging speed, but the 18 Pro Max charges faster.

The Z Fold 8 and Z Fold 8 Ultra, with 45W charging, reach 49% and 43% charge after 15 minutes respectively, with the Ultra charging slightly faster. The Razr Fold, with a 80W charging capability, fully charges in about 30 minutes, while the Pixel 11 Pro Fold lags behind with 29% charge after 15 minutes and 56% after 30 minutes due to its 30W charging speed.