What happens after the 'with over 500 battery charge life cycle'?

The storage capacity of the battery is reduced, so maybe it will be 80% as good as it was before. It shouldn't just stop working :)

Can I bring it on a plane? Is the product certified for it?

You can take this power bank on a plane. The cells within this power bank are lithium ion with a nominal voltage of 3.7V (5V is the output voltage at the USB port, not the voltage of the cells within the battery). Therefore the Wh rating for this power bank is 99.16Wh, below the limit.

Can you use all three input ports to recharge more quickly or must you only use one?

Hello my friend, even though this portable charger providing 3 different input ports to recharge itself, you can only choose one of them at one time. Thanks. Charmast.

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Description

⚡ Stay powered, stay unstoppable — the ultimate slim power bank for pros on the go!

SLIM YET MIGHTY - Ultra-thin 15.5mm design fits sleekly in your bag without weighing you down.
POWER THAT LASTS - Charge your iPhone 7 up to 8.5 times—never run out during crucial moments.
SAFETY FIRST ALWAYS - Advanced multi-protection system guards against overcharge, short circuit, and more.
SPEED MEETS VERSATILITY - Bidirectional USB-C port delivers rapid 3A input/output for ultra-fast recharges.
UNIVERSAL COMPATIBILITY - 3 input options (Micro USB, iOS, Type-C) plus 4 smart outputs adapt to all your devices.

The Charmast 26800mAh Power Bank combines massive battery capacity with cutting-edge bidirectional USB-C fast charging and multi-port versatility. Its ultra-slim design and intelligent safety features make it the perfect portable charger for smartphones, tablets, and more, ensuring you stay powered through your busiest days.

Specifications

Unit Count	1.0 Count
Item Dimensions L x W x Thickness	0.31"L x 0.15"W x 0.55"Th
Item Weight	338 Grams
Battery Cell Type	Lithium Polymer
Color	Black
Recommended Uses For Product	ipad, iphone
Charging Time	9 Hours
Compatible Devices	Tablet, iPhone 11/iPhone 11 Pro/iPhone 11 Pro Max/iPhone X/10 iPhone XR/XR MAX/iPhone X, iPhone 8 Plus, iPhone 8, iPhone 7 iPhone 6s/6/6S Plus 5/5S/SE/5C/4/4S, Nintendo Switch,Xiaomi,OPPO, Smartphone, HTC/OnePlus/HUAWEI/Google Nexus 5/5X 6/6P/ 7/9/10/Mate 9/10 Xiaomi;OPPO, Samsung Galaxy S8/ S7/ S7 Edge S6/ S6 Edge S 5/4 Note 8/5/4
Voltage	3.7 Volts
Power Source	Corded Electric
Amperage	3 Amps
Number of Ports	6
Connector Type Used on Cable	USB, Lightning, Micro USB
Battery Capacity	26800
Additional Features	LED charging indicators, USB C input & output, Power bank 26800 mAh. Very high capacity, USB C Powerbank USB C Portable Charger, Airplane Allowed, 3 Input & 4 Output / Charge 3-4 Devices at the Same Time, UItra-Thin / Allowed on Aircraft

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