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Description
One Slim Battery Case That Powers Four Big iPhones
If you carry an iPhone 14 Pro Max, 14 Plus, 13 Pro Max, or 12 Pro Max, you own one of the best 6.7-inch displays Apple ever made — and a battery that modern apps treat like an all-you-can-eat buffet. This 8500mAh-rated battery charging case is the fix: a slim 0.58-inch, 3.8-ounce power shell that roughly doubles your phone's runtime, props itself up with a built-in folding kickstand, and charges your iPhone at up to 15W. One case, four compatible flagship models, zero dead-phone anxiety. It fits the 6.7-inch body shared by these four phones precisely — buttons, port, and camera cutouts all line up.
10 Key Features
- 8500mAh Rated Capacity — the maker specifies a true, tested 8000mAh usable battery: enough to roughly double the runtime of a 6.7-inch iPhone.
- 15W Faster Charging — quicker top-ups than typical 5W battery cases; one owner measured 15% to 80% in about 20 minutes.
- Built-In Folding Kickstand — flip out the stand for movies, FaceTime, and recipes; it is a battery, a case, and a stand in one.
- Four-Model Fit — works with iPhone 14 Pro Max, 14 Plus, 13 Pro Max, and 12 Pro Max (all 6.7 inch).
- Slim and Light — only 0.58 in (about 14.7 mm) thick and 3.8 oz (about 108 g); pocketable, not a brick.
- Pass-Through Charging — one cable charges your iPhone first, then refills the case automatically.
- Encrypted Connector Chip — original-spec encryption chip means no nag pop-ups; the connector is rated for 8,000 insertion cycles.
- 10-Layer Safety Protection — smart chip guards against short-circuit, overheating, overcharging, and more.
- 4 LED Power Gauge — check the reserve at a glance in 25% steps (0–25–50–75–100%).
- Complete Kit — tempered glass screen protector, charging cable, and user manual included.
Materials & Specifications
The shell combines a flexible thermoplastic polyurethane (TPU) frame with a hard-shell back plate and raised bezels for 360° coverage. Rated capacity is 8500mAh on the listing title, with the manufacturer describing a "true 8000mAh" tested capacity — roughly 30Wh either way, far under the 100Wh airline carry-on limit. Output supports up to 15W charging to the phone; pass-through charging fills the phone first, then the case. Thickness is 0.58 in / ~14.7 mm and weight is 3.8 oz / ~108 g (manufacturer figures). Wired headphones and Bluetooth audio work while charging. Wireless charging is NOT advertised for this model — plan on cable or kickstand-down desk charging. See more charging gear in the Power Packs collection or browse all iPhone 14 Pro Max cases.
5 Real-World Use Cases
- The Long-Haul Commuter — train Wi-Fi, podcasts, and email burn 40% before 9 a.m.; the case quietly puts it back during the ride.
- The Binge-Watcher in Transit — the folding kickstand turns any tray table into a theater while 8000 real mAh keeps the show running.
- The Older-Phone Loyalist — a 12 Pro Max or 13 Pro Max with a tired battery gets a second life for a fraction of a battery replacement.
- The Job-Site Foreman — calls, photos, and plan PDFs from 6 a.m. to dark, with raised bezels and a hard back absorbing the daily knocks.
- The Weekend Camper — about 30Wh of reserve runs maps, camera, and flashlight all weekend, no outlet required.
Features & Benefits at a Glance
| Feature | Benefit |
|---|---|
| 8500mAh rated (true 8000mAh) battery | Roughly doubles a 6.7-inch iPhone's runtime |
| 15W charging output | Refills fast — about 15% to 80% in ~20 minutes |
| Folding kickstand | Hands-free video calls and movies anywhere |
| Fits 14 Pro Max / 14 Plus / 13 Pro Max / 12 Pro Max | One case covers four flagship models |
| 0.58 in thick, 3.8 oz | Slimmer and lighter than most battery cases |
| Pass-through charging | One cable charges phone first, then case |
| Encrypted connector chip | No accessory pop-ups, 8,000-cycle durability |
| 10-layer safety chip | Protection from overheat, overcharge, shorts |
| 4 LED indicators | Reserve level visible at a glance |
| Included tempered glass + cable | Everything you need in one box |
Installation Guide
1. Power the case off and remove any existing case from your iPhone. 2. Slide the bottom of the phone into the case's connector cradle until it seats fully. 3. Flex the top edge of the case over the phone's top corners until flush. 4. Press the rear power button once to start charging — the 4 LEDs show progress. 5. Press again to stop and save the reserve. 6. Flip out the rear kickstand whenever you want hands-free viewing. 7. Recharge phone and case together overnight with a single cable — the phone fills first.
Troubleshooting
Case charges itself but not the phone: reseat the phone so the connector is fully inserted, then hold the power button for 3 seconds; remove pocket lint from the phone's port first.
Accessory pop-up appears: momentary pop-ups can occur after iOS updates — detach and reseat the phone; the encrypted chip normally prevents them.
Kickstand feels stiff: that is intentional spring tension for stability; work it open and closed a few times and it loosens slightly.
Charging seems slow: confirm you are using the included cable; third-party charge-only cables can limit current below the 15W capability.
Case gets warm during pass-through: warmth is normal while phone and case charge in sequence; keep it off soft bedding and out of direct sun while plugged in.
Frequently Asked Questions
1. Which iPhones does this fit? The 6.7-inch iPhone 14 Pro Max, iPhone 14 Plus, iPhone 13 Pro Max, and iPhone 12 Pro Max only.
2. Which iPhones does it NOT fit? It does NOT fit the iPhone 14, 14 Pro, 13, 13 Pro, 13 Mini, 12, 12 Pro, or 12 Mini — those bodies are smaller and the connector will not align.
3. How many full charges will I get? With a true 8000mAh (~30Wh) reserve, expect roughly 1.2–1.4 full charges for a 14 Pro Max (4,323mAh battery) after conversion losses — the maker rates it as doubling your phone power. Treat exact counts as estimates.
4. Is the capacity 8500mAh or 8000mAh? The listing title rates it 8500mAh; the manufacturer's own spec sheet calls it a "true 8000mAh" tested capacity. We quote both for honesty.
5. How fast does it charge the phone? Up to 15W — owners report going from 15% to 80% in around 20 minutes.
6. Does it support wireless or MagSafe charging? No — wireless charging is not advertised for this model. Charge by cable, or remove the case for a 15W MagSafe pad.
7. Can I take it on a plane? Yes — about 30Wh, well under the 100Wh FAA carry-on limit. Cabin baggage only, never checked.
8. Can I charge phone and case at the same time? Yes — pass-through charging fills your iPhone first, then the case, from one cable.
9. How thick and heavy is it? 0.58 in (~14.7 mm) thick and 3.8 oz (~108 g) — among the slimmest in its capacity class.
10. How do I check remaining power? Four LED indicators show 0–25%–50%–75%–100% of the case's reserve.
11. Is it safe? A 10-protection smart chip guards against short-circuiting, overheating, and overcharging, and the connector is tested to 8,000 insertions.
12. What's in the box? The 8500mAh-rated battery case, a tempered glass screen protector, a charging cable, and a user manual.
13. What is the return policy? To start a return, you can contact us at gorillacasestore@gmail.com. If your return is accepted, we'll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
14. How fast is shipping? Free shipping across the USA, typically arriving in under a week.
15. Any discount available? Yes — code 10OFF takes 10% off your entire order at checkout.
What Owners Are Saying
★★★★★ Tomás V., tour guide, Lisbon — "My 13 Pro Max is three years old and was dying by lunch. With this case it outlasts my eight-hour walking tours, and the kickstand is perfect for lunch-break football streams."
★★★★★ Hannah B., paramedic, Manchester — "12-hour shifts, constant radio apps, zero charging chances. It refilled my 14 Pro Max from 15% to 80% in about 20 minutes between calls."
★★★★★ Kenji M., commuter, Yokohama — "Slimmer than I expected — 14.7mm total is thinner than my old wallet case. It still fits my jacket pocket with the kickstand flat."
★★★★★ Gabriela F., real estate agent, São Paulo — "I show 10 properties a day on my 14 Plus. The LED gauge tells me exactly what's left, and the included screen protector saved me a separate purchase."
★★★★½ Owen D., site engineer, Dublin — "Brilliant value. Half a star off only because there's no wireless charging — but at this price, with 15W wired and a stand, I'm not complaining."
Keep Reading: Gorilla Cases Guides
- Best iPhone 12 Pro Max Magnetic Matte Case 2026: MagSafe Review
- iPhone 15 Pro Max Case Battle: Leather Wallet vs Waterproof vs Metal Kickstand 2026
Give your big-screen iPhone the all-day battery it deserves. Order today with code 10OFF for 10% off, enjoy free USA shipping with delivery in under a week, and join the Gorilla Family — we keep you charged and protected.