Car Key Fob Battery Equivalents

A CR2032 is a 3V lithium manganese-dioxide coin cell, 20.0 × 3.2 mm, typically 220–240 mAh (about 0.66–0.72 Wh). Fresh cells often measure 3.2–3.4 V. DL2032 and ECR2032 are brand labels for the same size. CR2025 and CR2016 share the 20 mm diameter but are thinner and not drop-in replacements. Do not use rechargeable LIR2032 (~3.6–3.7 V) unless the device is designed for it.

CR2025 is a thinner 3V lithium coin cell with the same 20 mm diameter as CR2032 but only 2.5 mm height and lower capacity (~160–170 mAh). Many slim key fobs specify CR2025 — do not assume CR2032 will fit.

CR2016 is the thinnest common 20 mm lithium coin cell at just 1.6 mm height (~90–100 mAh). It is popular in ultra-slim remotes and some key fobs where CR2025 or CR2032 will not fit.

CR1632 is a 16 × 3.2 mm, 3V lithium coin cell. Shoppers often mix it up with CR2032 because both end in “32” — those last digits are height, not a family. Diameter is 16 mm versus 20 mm.

CR1620 is a 16 × 2.0 mm lithium coin cell for compact devices.

CR2032L is not a separate IEC size. It is a 20 × 3.2 mm, 3V lithium coin cell whose “L” suffix is manufacturer-specific — often a low-drain mark or a brand/terminal variant. If your device asks for CR2032, a genuine CR2032L of the same voltage is usually acceptable; if it asks for CR2032L, a standard CR2032 usually fits.

LIR2032 is a rechargeable lithium-ion cell in the 20 × 3.2 mm outline. It is the product people mean by “rechargeable CR2032”. Nominal voltage is about 3.6–3.7 V (up to ~4.2 V fresh off the charger) and typical capacity is only ~35–45 mAh — a fraction of a primary CR2032.

CR2450 cells deliver high capacity in a 24.5 × 5.0 mm, 3V lithium package (~550–620 mAh) — ideal for devices that must run months on a single coin cell. Do not confuse with the smaller CR2032 or the thinner CR2430.

The A23 (also sold as 23A or MN21) is a compact 12V alkaline cylinder (~10.3 × 28.5 mm) used in garage remotes, doorbells, and older keyless-entry transmitters. It packs eight tiny button cells in series inside one can — high voltage, modest capacity.