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Welcome to a Biomedical Battery specialist of the Lenovo Laptop Battery
The chiclet-style keyboard is quite comfortable to use, even if it's a little cramped given its small size. Ditto the touchpad, which is slightly slow to respond when you click on it. The 11.6-inch LED anti-glare screen is a bit dull, with somewhat narrow viewing angles. It has the same 1,366-by-768 resolution as the HP Stream 13 and the Acer Aspire E3-111-C1BW, which is perfectly fine for writing word documents or watching a YouTube video, but you need to tilt the S21e-20 fairly far back—at least 100 degrees—in normal light to be able to see the screen clearly.
Our review unit has 64GB of eMMC flash storage and 2GB of RAM. Slightly less expensive laptops like the HP Stream 13 and the E-Fun Nextbook only come with 32GB—though, as with the S21e-20, they're expandable with SD and USB storage with batetry like Lenovo FRU 92P1188 Battery, Lenovo 3000 C200 Battery, Lenovo 3000 N100 Battery, Lenovo 42T4815 Battery, Lenovo ThinkPad Edge E30 Battery, Lenovo L3000 G230 Battery, Lenovo L08S6D21 Battery, Lenovo L08S4X03 Battery, Lenovo L08S7Y03 Battery, Lenovo Ideapad U110 Battery, Lenovo 41U5025 Battery, Lenovo L09S8L09 Battery. (Lenovo also sells an S21e-20 unit with 32GB of storage, for $50 less.) If you're willing to shell out a few more shekels, the Acer TravelMate B (TMB115-MP-C23C) is still budget-friendly at a list price of $379 and features 4GB of RAM, a 500GB hard drive, and a touch screen. The S21e-20 comes with a one-year warranty.
With a 2.16GHz Intel Celeron Processor N2840, performance on the S21e-20 is pretty sluggish. On the PCMark 8 Work Conventional test, which tests overall work performance, it scored 1,533 points. That's lower than the Dell Inspiron 15 Non-Touch, which scored 1,554, and much lower than the HP Stream 13 (1,771).
Graphics performance isn't any more promising. The S21e-20 scored 1,150 on the 3DMark Cloud Gate graphics test. That's better than the E-Fun Nextbook 10.1 (952), but is lower than the Acer TravelMate B (1,435). It also lost out to the HP Stream 13, which scored 1,245. On our Heaven gaming test, the S21e-20 stuttered at 2.2 frames per second, but that's to be expected from a laptop with integrated graphics.

Its multimedia scores are nothing to write home about, at 19 minutes 21 seconds on the Handbrake test, and 13:50 on the Photoshop CS6 test. The Dell Inspiron 15 Non-Touch (3531) handily beat the S21e-20 in Handbrake (11:00), and the HP Stream 13 edged it out on the CS6 test (13:31).
If you're looking into buying a budget laptop, you're probably not expecting high-end specs and performance. But battery life should be toward the top of your list. While the S21e-20's score of 6 hours 3 minutes on our battery rundown test isn't terrible, it can't quite hold up to other laptops in the category. Though it's a larger system, the Dell Inspiron 15 Non-Touch lasted longer (6:19), as did the Acer TravelMate B (7:32). The S21e-20 was handily beaten by the HP Stream 13 (9:09). Overall, performance for the Lenovo S21e-20 is just under par for a budget laptop.
The Lenovo S21e-20 is a decent ultraportable budget laptop, with a fair share of storage, and it runs smoothly if you're not using intensive applications like Adobe Photoshop. If you're a student with modest computing needs—like writing papers and doing research—the S21e-20 is a perfectly good computer that is portable and wallet-friendly. However, the HP Stream 13 remains our Editors' Choice for budget ultraportable laptops, with much better performance, a larger, brighter display, and a more attractive design for less.