![]() We should probably label this chart "All The 4K Displays Go Down Here." Though Lenovo claims greater than 9 hours of battery life (depending on workload) on its FHD+ display option with the new ThinkPad X1 Carbon, our UHD+ 4K display-equipped model managed only a little over 5.5 hours of uptime during always-on HD video playback. On the Windows Power slider, we selected the position labeled "Better Battery Life" and we stuck to the default power profile Lenovo configured on the system. Windows 10's Focus Assist was enabled to block all notifications and the screen was calibrated to as close to 115 lux as possible according to our light meter. Our custom video playback battery test times how long each laptop can play back video at the display's native resolution. ![]() ThinkPad X1 Carbon Gen 9 Battery Life Test Finally, what was most impressive perhaps is that Lenovo's thermal solution with the new ThinkPad X1 Carbon only bled off about 5 percent of its full performance, when plugged in and under continuous load of a 10 minute Cinebench R23 stress test loop. This area is completely out of contact with the user with normal typing hand position, but also at 111 degrees F, thermals are well within skin contact thresholds. The warmest part of the machine is just under the display where the back edge cooling vent is located. Not only is it well-behaved with completely tame acoustic output at around 44db (ambient room noise floors are typically around mid 30s or so) but it also stays cool under load. In short, Lenovo designed an excellent cooling solution with the new ThinkPad X1 Carbon. ThinkPad X1 Carbon Gen 9 Max Surface Temp At Thermal Saturation Here's how that cooling system performs under load. The other notable observation here is the X1 Carbon's single heat pipe and fan sink design, which is strapped with a pair of blowers, that pull cool air in through the bottom of the machine and exhaust it immediately through the back edge of the keyboard, just under the display. ![]() Unfortunately, as is common these days, the ThinkPad X1 Carbon Gen 9's DDR4x RAM is soldered to the motherboard and not visible here, nor are there any SODIMM sockets, so choose that memory configuration wisely boys and girls. Our hunch is that Lenovo designed the machine this way to make storage configurations as flexible as possible in their production flow, but it also serves the consumer well. This does give users the option of dropping in another SSD for additional storage, which is a nice touch. Here you can also see a copper heat spreader for the machine's primary M.2 SSD, though there is a spare M.2 socket with a short M.2 2242 style port available as well (top left corner). Once inside this wafer-thin beastie, you can see the bottom-firing woofers that we mentioned earlier, along with a large area for a thin, but capacious, 57 Wh battery. ![]()
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