BCI Battery Groups
Marine batteries come in various sizes, having different capacities, voltages and performances in general.
Depending on the size, batteries are categorized in various size groups. Of course, there are always 'special' size batteries, so pay attention when buying new batteries.
Battery Dimensions By Group Size
Following tables show industry standard group sizes according to their external dimensions. Battery compartments are usually made for a certain battery standard, so knowing both values is important - larger battery can't fit into smaller compartment, while smaller can, but must be additionally fixed to avoid any damage to the boat or battery.
Most popular battery group sizes:
Following BCI battery group size chart lists most common battery sizes.
Note: we have really tried to verify information provided in this table, but there are no warranties of any kind.
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Many BCI battery groups differ by only fraction of an inch and they can be used interchangeably, if and only if the new battery fits the 'old' battery tray/box, and features equal or better charging/discharging characteristics compared to the old battery.