Simply Auto SB-CR2032 CR2032 3V 220mAh Lithium Coin Cell Car Key BatteryA car key that needs pressing twice, only works within a metre of the door, or has stopped responding altogether is almost always telling you the same thing: the coin cell inside is flat. The Simply Auto CR2032 Battery is the cell most modern keys take, and swapping it is a two-minute job with a small flat-blade screwdriver rather than a trip to the dealer.A CR2032 battery is 3 volts. It is a lithium manganese dioxide coin cell measuring 20mm across and 3.2mm thick, with pressure contact terminals and a 220mAh capacity. Lithium chemistry holds that 3V steady under load instead of tapering off gradually, so your remote keeps its full range almost until the cell is spent, and an unopened battery keeps for up to 10 years in storage. It is CE, UKCA and RoHS compliant.Checking fitment takes seconds. Pop your key case open and read the code printed on the face of the old battery: if it says CR2032, 5004LC, DL2032 or ECR2032, this is a direct drop-in. Note the orientation before you lift the old cell out and handle the new one by its edges to keep finger grease off the contacts.Beyond car key fob battery replacement, the CR2032 also powers watches, bathroom scales, wearables and heart rate monitors, tyre pressure sensors, glucometers and digital thermometers, garage door remotes, bike accessories, calculators, toys and the CMOS backup on desktop PC motherboards.If your key takes a different cell, the full Simply Auto car key battery range covers CR2016, CR2025, CR2450, CR1220, CR1616, CR1620, CR1632, CR2430 and the 23A, 27A and A76 alkalines.