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Description
Give Your iPhone 11 Pro Max a Second Life — and a Second Battery
The iPhone 11 Pro Max is one of the best phones Apple ever built — a brilliant 6.5-inch display, a triple camera that still holds up, and a body that refuses to quit. The only thing aging is the battery. This iPhone 11 Pro Max Battery Case 10000mAh – Slim Charger fixes that overnight: a 10,000 mAh rechargeable lithium-polymer pack built into a protective hard-shell case, engineered exclusively for the iPhone 11 Pro Max (6.5-inch). It adds 180%+ extra power — around 8+ hours of additional talk time or 12+ hours of web browsing — while raised edges and reinforced corners protect the phone you already know and love. Skip the $100+ battery replacement appointment; slide this on in ten seconds instead.
10 Key Features
- 10,000 mAh Extended Battery: adds 180%+ power — nearly two full charges for the iPhone 11 Pro Max's 3,969 mAh cell (real-world, after conversion losses).
- 8+ Hours Extra Talk / 12+ Hours Web: hard numbers, not marketing fog — a full workday of additional screen time.
- Sync-Through Technology: charge the case and phone together, and sync to your MacBook or PC, without ever removing the case.
- Model-Exclusive Fit: molded only for the iPhone 11 Pro Max (6.5-inch) — every button, the mute switch, and the triple-camera ring line up perfectly.
- Hard-Shell Protection: durable polycarbonate with raised sides protects the screen edge and camera from scratches, drops, and daily wear.
- 4-LED Power Gauge: tap to check the reserve at 25% / 50% / 75% / 100% before you head out.
- On/Off Power Switch: you decide when to spend the reserve — charge on demand, save the rest.
- Ultra-Thin for Its Class: a 10,000 mAh pack in a slim one-piece design that still slides into a jacket pocket.
- Wired Headphone Friendly: supports the wired headphones that came with your phone.
- Port-Saver Bonus: daily charging wear moves to the case's port instead of your iPhone's — owners report it preserves the phone's connector long-term.
Materials & Specifications
- Compatibility: iPhone 11 Pro Max (6.5-inch) ONLY — NOT iPhone 11 or iPhone 11 Pro
- Battery capacity: 10,000 mAh rechargeable lithium-polymer
- Extra runtime: 180%+ additional power; 8+ hrs talk or 12+ hrs web browsing
- Charging: wired, standard 5 W-class charging (estimated — factory does not publish input/output figures); wireless charging NOT supported
- Materials: polycarbonate hard shell + rubber detailing
- Added weight: approximately 7–8 oz / 200–230 g (estimated — not published)
- Added thickness: approximately 6–8 mm at the battery hump (estimated)
- Indicators: 4 LED charge-level lights + power switch
- Color: Black
Find more options for your Apple phone in our Apple Cases collection, or browse all portable power in our Power Packs collection.
5 Real-World Use Cases
- The Hand-Me-Down Hero: parents passing the 11 Pro Max to a teenager — the case solves the aging battery and adds drop protection in one move.
- The Delivery Driver: GPS, order apps, and customer calls for a 10-hour shift — the 10,000 mAh reserve means the phone never sees a charger until bedtime.
- The Budget Maximalist: keeping a perfectly good phone two more years instead of paying flagship prices — this case costs less than a battery replacement.
- The Weekend Camper: two days off-grid with photos, maps, and a flashlight — the reserve covers the whole trip without a separate power bank.
- The Night-Shift Nurse: 12-hour rotations where charging stations are occupied — tap the switch on a break and walk out at 100%.
Features & Benefits at a Glance
| Feature | Benefit |
|---|---|
| 10,000 mAh battery | 180%+ extra power — 8+ hrs talk, 12+ hrs web |
| Sync-through technology | Charge and sync without removing the case |
| Model-exclusive 6.5-inch fit | Perfect button, switch, and camera alignment |
| Hard-shell + raised edges | Screen-edge and camera protection from drops |
| 4-LED gauge + power switch | Spend your reserve only when you choose |
| One-piece slim design | Pocketable despite the big battery |
| Port-saver charging | Daily cable wear hits the case, not your iPhone |
| Wired headphone support | Keep using the earbuds that came with the phone |
| Lithium-polymer cells | Stable, reliable power with built-in protections |
| Costs less than a battery swap | New-phone stamina without the repair shop |
Installation Guide
1. Charge the battery case fully before first use — all 4 LEDs glow solid at 100%. 2. Flex the top edge of the case open and slide your iPhone 11 Pro Max in bottom-first until the connector seats with a firm click. 3. Ease the top corners back over the phone so the shell sits flush all the way around. 4. Flip the power switch (or press the button) to start charging your iPhone; switch it off to bank the rest of the reserve. 5. At night, plug one cable into the case — sync-through charges your phone and the case from the same outlet. 6. Pair it with a tempered glass protector for the front face, since the raised edges guard the screen's borders but not the glass itself.
Troubleshooting
Case won't charge the phone: make sure the power switch is on and the connector is fully seated — remove and reinstall the phone if needed.
Phone won't fit: double-check your model in Settings > General > About. This shell fits the iPhone 11 Pro Max (6.5-inch) only — the iPhone 11 and 11 Pro are different sizes.
Case isn't charging on a Qi pad: this model does not support wireless charging — recharge it with a cable.
Slow recharge of the case: a 10,000 mAh reserve over standard wired input is an overnight charge by design — plug it in when you sleep.
Computer doesn't see the phone: use a data-rated cable in the case's port — sync-through works with MacBooks and PCs, but charge-only cables block data.
Frequently Asked Questions
1. Which phones does this fit? The iPhone 11 Pro Max (6.5-inch) ONLY. It does NOT fit the iPhone 11 (6.1"), iPhone 11 Pro (5.8"), XS Max, or any other model.
2. How much extra battery do I really get? 180%+ additional power — the iPhone 11 Pro Max has a 3,969 mAh cell, so the 10,000 mAh pack delivers roughly 1.8 full charges in real-world use.
3. How many extra hours is that? About 8+ hours of additional talk time or 12+ hours of web browsing per full case charge.
4. Does it support wireless charging? No — this model recharges by cable only. The sync-through design means one cable charges the phone and case together.
5. Can I sync to my computer with the case on? Yes — sync-through technology passes data to your MacBook or PC without removing the case.
6. How fast does it charge the phone? Standard 5 W-class wired charging (estimated) — steady and battery-friendly rather than fast-charge.
7. Does it add much bulk? Approximately 7–8 oz (200–230 g) and 6–8 mm at the battery hump — both estimates, as exact figures are not published. Slim for a 10,000 mAh case, but you will notice it.
8. Will it protect my phone from drops? Yes — the polycarbonate hard shell and raised sides handle everyday pocket- and desk-height drops (approximately 3–4 ft, estimated). There is no formal MIL-STD rating, and the screen face itself is not covered.
9. Can I leave it on all the time? Absolutely — most owners do. Use the power switch to charge only when needed, which maximizes the number of useful cycles.
10. Will it stop charging when my phone is full? Charging stops when the reserve is spent or you flip the switch off; most owners top up to 100% and switch off to save the rest.
11. Does it work with MagSafe accessories? No — the iPhone 11 Pro Max predates MagSafe, and the battery pack would block magnetic mounts regardless.
12. Can I use wired headphones? Yes — the case supports the wired headphones that came with your phone.
13. Is this cheaper than replacing my iPhone battery? Yes — a shop battery swap typically runs $89–$99 before tax; this case costs less, adds 2.5x the capacity, and protects the phone too.
14. 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.
15. How fast is shipping, and is there a discount? Shipping is FREE across the USA and orders typically arrive in under a week. Use code 10OFF at checkout for 10% off.
What Owners Are Saying
★★★★★ Glenda M., retired teacher, Tampa, USA — "My 11 Pro Max was dying by lunch. Now it lasts two full days. This case saved me from buying a new phone."
★★★★★ Pieter V., courier, Amsterdam, Netherlands — "Ten-hour delivery shifts with GPS running nonstop. The 10,000 mAh pack gets me home with charge to spare every single day."
★★★★★ Carmen L., market vendor, Buenos Aires, Argentina — "I run my card reader and WhatsApp orders on this phone all day. The switch lets me save power for the evening rush. Perfect."
★★★★★ Raj P., rideshare driver, Toronto, Canada — "Navigation, trip apps, music — my battery percentage basically doesn't move anymore. The hard shell already ate one curb drop."
★★★★½ Fiona D., student, Galway, Ireland — "It's a bit chunky in small hands, but my four-year-old phone now outlasts my friends' new ones. Would buy again."
Keep Reading: Gorilla Cases Guides
Keeping an older iPhone alive? You'll like our iPhone 12 Pro Max magnetic matte case review and our iPhone 15 Pro Max case battle.
Your iPhone 11 Pro Max still has years left — give it the battery to prove it. Order the iPhone 11 Pro Max Battery Case 10000mAh today with code 10OFF for 10% off, enjoy FREE USA shipping with delivery in under a week, and join the Gorilla Family — we keep great phones going.