Mophie · Waterproof Phone Cases
Mophie Juice Pack Apple iPhone 17 Pro Max
Skip until Mophie discloses waterproof treatment chemistry.
Mophie Juice Pack uses unspecified waterproof coatings on battery casings, typical PFAS risk vectors. Brand provides no PFAS disclosure or third-party verification.
The safe swap
Incipio
Incipio DualPro for iPhone 16 Pro Max
85/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Lithium battery, plastic housing, elastomer seals with unspecified waterproof coatings
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Lithium battery thermal and mechanical rupture
Lithium-ion battery packs can vent flammable electrolyte or rupture if overcharged, physically crushed, or exposed to extreme heat. This is a known failure mode across all portable batteries; no specific incidents tied to Mophie Juice Pack have been widely publicized, but the risk is inherent to the technology.
PFAS
The elastomer seals are treated with an unspecified hydrophobic substance. This coating may contain PFAS (graded separately as Poor/40), other synthetic chemicals, or fluorine-free alternatives. Mophie's silence prevents determination of whether the coating poses dermal or inhalation risks during normal use.
Source: ATSDR ↗Plastic housing degradation and microplastic release
Polycarbonate or ABS housings can degrade under UV exposure, heat cycles, or aggressive cleaning. Degradation may release plastic particles into the environment; risk is lower during normal use than for items in direct skin contact but increases if the unit is dropped repeatedly or stored in sunlight.
Electrolyte leakage if seal integrity fails
If elastomer seals crack or fail due to age or physical damage, battery electrolyte (lithium salt solutions) can leak. Direct skin contact with electrolyte causes irritation; inhalation is unlikely unless the unit is disassembled or damaged severely.
Inadequate dissipation of exothermic reactions during malfunction
If the internal battery short-circuits or undergoes thermal runaway, the plastic housing may not conduct heat effectively, concentrating internal temperature. This increases risk of case deformation, electrolyte venting, or fire if the unit is held directly against skin or in a closed pocket.
The full breakdown
What it's made of and why it matters
This Juice Pack houses a lithium-ion battery (the energy storage core), plastic housing (likely polycarbonate or ABS for rigidity and electrical safety), and elastomer seals treated with an undisclosed waterproof coating to achieve water resistance. The lithium battery is the primary safety concern because it stores high energy density and can vent or rupture if damaged, overcharged, or exposed to extreme heat. The plastic housing's integrity directly affects whether the internal battery remains protected from physical stress and moisture ingress over time.
The brand's record and disclosure
Mophie (owned by ZAGG, a Hearst subsidiary) has not publicly disclosed the specific chemistry of waterproof treatments used in its elastomer seals or coatings. This silence on PFAS use in water-resistant accessories is common across the industry but represents a transparency gap. No major recalls specific to Juice Pack models have been widely documented for battery or chemical hazards, but the lack of proactive disclosure limits independent verification of material safety.
How it compares in its category
Portable battery packs typically rely on lithium cells and plastic housings; Mophie's design is conventional. Competitors like Anker and Belkin similarly withhold waterproof chemistry details, so this product is not uniquely opaque. However, some premium brands (e.g., certain outdoor-focused makers) have begun committing to PFOA/PFAS-free certifications for outdoor gear, setting a higher bar that Mophie has not matched.
If you buy it
Keep the unit away from prolonged heat (above 35C/95F), direct flames, and crushing force, as physical battery damage or thermal stress can trigger venting. Do not charge continuously for more than 24 hours or leave plugged in unattended overnight. Inspect the elastomer seals periodically for cracks; if visible damage occurs, discontinue use immediately. Store in a cool, dry place and replace the unit if the battery no longer holds charge reliably or if the housing shows swelling.
What we don’t know
- Basis
- Model estimate, 35% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Mophie has made none
Formulations change between production runs, so check the current label. How we grade.
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More waterproof phone cases grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.