CMF Buds Pro 2 by Nothing (Dark Grey): problems, parts and running costs

Checked: 2026-10-08

Summary

The budget-earbud feature set is strong for the price, but the deciding question is battery longevity: multiple owners report severe playback decline after roughly 3–10 months, and there are no user-serviceable parts. There is no subscription or mandatory consumable — optional third-party ear tips run about $8 when they wear out. Strong value at $39 or less, fair at $40–49; at $60 or more, compare the Nothing Ear (a) or the soundcore P31i.

Common problems and fixes

Battery degradation and charging failures — owners report uneven left/right charging, a bud stopping at 70–95%, and severe playback decline after roughly 3–10 months, sometimes under two hours or even minutes; a September 2026 owner described a case that stopped supplying power unless plugged in, and a July 2026 case reportedly failed after six weeks. These reports are anecdotal and cannot establish a failure percentage. Fix per CMF’s support documentation: clean contacts with a soft lint-free cloth, seat the buds firmly, check for firmware updates and reset (hold the setup button about 10 seconds until the red flash) — some owners report contact cleaning helped, others say resets did not. The manual warns against replacing the internal battery yourself; Nothing US offers a 12 months limited warranty on direct purchases, with mixed after-sales outcomes reported. [10][11][13][14][2][18]
Muffled call quality — GSMArena found callers hearing muffled sound even in quiet rooms; RTINGS rates the microphone passable, while SoundGuys praises wind-noise suppression. [4][7][3]
ANC leaves high-pitched sounds audible — cutlery, keys and leaf crunch stay audible, sometimes feeling amplified; the ANC is strongest against low frequencies like traffic and air conditioning. [15][7]
Smart Dial accidental activation — TechRadar found the case dial prone to accidental turns and presses in pockets, with a startlingly loud notification sound and a delay between input and result. [6]
Bass-heavy default sound — SoundGuys measured 12–15 dB of bass elevation above its preferred response; the Nothing X app’s 3-band EQ limits how much you can tune it back. [3]
Fit depends on your ears — stock ear tips may not stay in (TechRadar found them not grippy enough) and there are no stabilizer wings or hooks; third-party tips are the common fix. [6][7]

Parts and consumables

Silicone ear tips (S, M, L included) — replace only when worn, damaged or unhygienic; no specified schedule. A third-party six-piece S/M/L compatible set was listed at Walmart at $7.74 (white) or $7.99 (black) in October 2026, excluding shipping; no verified CMF OEM part number exists. [2][17]

Yearly running cost

$0 per year in required recurring purchases — no subscription, filter or scheduled consumable, and electricity use is not quantified in the sources. Optional ear tips cost about $8 when needed, not necessarily annually. At the $49 purchase price, a hypothetical replacement after two years equals $24.50 per year of purchase cost; failure after one year equals $49 per year. These are arithmetic scenarios, not predicted service lives.

When it is a good buy

$39 or less (Nothing US collection promoted some colors at $39, October 2026) — strong value if you are willing to accept the unmeasured battery longevity risk. [19]
$40–49 — a fair price for the feature set; $49 was available direct from Nothing US in October 2026, and Walmart had Dark Grey/Black at $49; not a rare price. [1][23]
$60 or more — compare the Nothing Ear (a), advertised at $59 in Nothing’s US earbuds collection in October 2026 (its product page separately showed $79), for an upgraded Nothing option, or the soundcore P31i at $49.99 direct for a conventional case and a rated 8 h with ANC / 40 h total. [20][19][21]
$80–90 — the EarFun Air Pro 4 was $89.99 direct and adds wireless charging plus aptX Lossless on supported devices; choose it if codec flexibility and wireless charging justify the extra cost. [22]