Juice Pack Battery Case for iPhone 15 vs TPU Guide Waterproof Case: which is safer?
Mophie Juice Pack Battery Case for iPhone 15 is the clear pick. Sea to Summit TPU Guide Waterproof Case carries a failing PFAS grade, and we never recommend buying a failing product.
Our pick
Mophie
Juice Pack Battery Case for iPhone 15
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleLithium-ion battery thermal runaway risk
PossibleElectromagnetic field exposure
PossibleCounterfeit or degraded battery cell defects
Sea to Summit
TPU Guide Waterproof Case
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleUndisclosed waterproof coating composition (possible PFAS)
PossibleTPU thermal degradation and fume release
ReportedCoating degradation and secondary exposure
Where these two actually differ
- We flag Lithium-ion battery thermal runaway risk, Electromagnetic field exposure and Counterfeit or degraded battery cell defects on the Mophie and not on the Sea to Summit.
- We flag Undisclosed waterproof coating composition (possible PFAS), TPU thermal degradation and fume release, Coating degradation and secondary exposure and Fragmentation and microplastic shedding on the Sea to Summit and not on the Mophie.
- The Mophie is Lithium-ion battery, plastic housing, metal contacts where the Sea to Summit is TPU (thermoplastic polyurethane) with waterproof treatment, which is most of the difference in these two grades.
- The gap is 45 points, wide enough that this is not a close call, and the Mophie is the one to buy.
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