Galaxy S25 Ultra Waterproof Case MagSafe — Nautical Slim vs Juice Pack Battery Case for iPhone 15: which is safer?

Mophie Juice Pack Battery Case for iPhone 15 is the clear pick. Ghostek Galaxy S25 Ultra Waterproof Case MagSafe — Nautical Slim carries a failing PFAS grade, and we never recommend buying a failing product.

Ghostek

Galaxy S25 Ultra Waterproof Case MagSafe — Nautical Slim

PFAS grade

F 40/100

Overall grade

F 28/100

Verdict

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Hazard flags

⚑ 3

Material

Polycarbonate/TPU blend, waterproof coating unspecified

Confidence

45%

PossiblePFAS in waterproof coating

PossibleTPU degradation and off-gassing

PossibleCoating particulate shedding

Why this grade

Our pick

Mophie

Juice Pack Battery Case for iPhone 15

PFAS grade

B 85/100

Overall grade

C 73/100

Verdict

Buy

Hazard flags

⚑ 3

Material

Lithium-ion battery, plastic housing, metal contacts

Confidence

65%

PossibleLithium-ion battery thermal runaway risk

PossibleElectromagnetic field exposure

PossibleCounterfeit or degraded battery cell defects

Why this gradeBuy

Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →

More waterproof smartphone cases: see the full ranking