Apple iPhone 6s / 6s Plus - View Battery Info
Here's info on the battery specs (e.g., Talk Time, Standby Time, etc.) for your iPhone 6s / 6s Plus.
Battery Specifications Apple® iPhone® 6s Plus
Up to 384 hours Standby Time
Up to 12 hours of internet use on 4G
Up to 12 hours of internet use on Wi-Fi
Up to 14 hours of video playback
Up to 80 hours of audio playback
Battery Specifications iPhone 6s
Up to 250 hours Standby Time
Up to 10 hours of internet use on 4G
Up to 11 hours of internet use on Wi-Fi
Up to 11 hours of video playback
Up to 50 hours of audio playback
Battery Basics
Both the iPhone 6s Plus and the iPhone 6s have non-removable batteries.
Battery life depends on the network, signal strength, temperature, features and accessories used.
It's common for batteries to be warm from use or charging.
Only use manufacturer-approved charging accessories to avoid potential damage to the device and/or battery.
Operating Temperatures
Some heat is anticipated and perfectly normal, though the phone should not become too warm to handle comfortably.
For more info on iPhone's operating temperatures and temperature management, refer to this
Apple Support page .