My iPhone 6s starting to respond slow and freeze at times when searching the web

timmy159 wrote: "80%"

That's not a healthy battery and, if it's the original one, it has declined thru age & use. So have the battery replaced and your iPhone 6s will perform like new:

iPhone Battery & Power Repair

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timmy159 wrote: "See videos how to seems easey"

Apple says: "Battery replacements should be performed only by technicians who have completed Apple service training and who use Apple genuine parts and tools. These service providers include Apple Authorized Service Providers, or Independent Repair Providers using genuine Apple parts. Don't attempt to replace the iPhone battery yourself. Replacements performed by untrained technicians might not follow proper safety and repair procedures and could result in improper replacement or repair. This could also damage the battery, cause overheating, or result in injury." Source:

About genuine iPhone batteries

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85% is still low. I would suggest getting a new battery.

What is the battery health level? If 80% or less, get a new battery.

timmy159 wrote: "How do i check the health?"

It's the Maximum Capacity % here:

Settings > Battery > Battery Health

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You need a new battery. Get an appointment at an Apple store for this.

An iPhone is not user serviceable. Do not change the battery yourself. You need to get that done at an Apple store.