2025 Battery Voltage Drop. The battery must have the same dimensions (20mm in diameter and 2.5mm thick) to fit properly in the device. When the battery is in the system it's closed cell voltage under load.

Setting a usable capacity prolongs battery life because each charge cycle isn’t a full one Battery voltage can drop during driving due to several factors, including increased electrical load from using multiple accessories, a bad alternator not providing enough power or a weak battery that can’t maintain its charge.