Samsung’s Galaxy Z Fold7 may look sleeker than last year’s model, but under the hood, it sticks to familiar specs — a 4,400mAh battery and 25W charging, just like the Galaxy Z Fold6. So, how does it actually perform when plugged in? A recent charging test puts both foldables head-to-head, and the results offer some interesting insights.
Tech YouTuber Ben from Lover of Tech put the Z Fold7, Z Fold6, and Galaxy S25 Ultra through a side-by-side charging test, using official Samsung chargers — 25W for the Folds and 45W for the Ultra. To keep things fair, all devices had batteries rated at 100% health. The test, shared on July 17, shows the Z Fold7 consistently edging ahead of its predecessor, though by small margins.
At the 15- and 30-minute marks, both Fold models were neck and neck — 29% and 54% respectively. But after 45 minutes, the Z Fold7 pulled slightly ahead at 74%, compared to the Fold6’s 70%, and maintained that lead through the end. The Fold7 reached 100% in 1 hour 26 minutes, finishing just four minutes faster than the Fold6.
But more notably, the Z Fold7 also ran cooler during charging, averaging around 2°C lower than the Fold6. This cooler performance likely comes down to Samsung’s improved heat management — possibly aided by the Fold7’s slimmer design and updated thermal system. While this lower temperature might seem like a minor upgrade, it can have a meaningful impact on long-term battery health.
As for the Galaxy S25 Ultra, with its larger 5,000mAh battery, took 1 hour 17 minutes to fully charge.
While Samsung hasn’t changed the charging hardware, subtle software tweaks — possibly tied to One UI 8 — seem to have given the Z Fold7 a slight edge over the Fold6 in both speed and temperature.
Are these few minutes’ difference and cooler operation enough to justify its $1,999 price tag? That’s up to buyers. But it’s clear Samsung’s latest foldable brings more to the table than just a design refresh.
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