Ampere Hour Capacity (Non Starter Batteries) - <1Ah to +200Ah.

Installation Scheme - Single battery, series, parallel or series-parallel.

Cold Crank Amps (Engine/Generator Starter Batteries) - CCA, Reserve.

Chemistry - AGM, GEL, traditional wet.

Duty Cycle - Deep cycle or standby/emergency use.

Ampere Hour Safety Factor - Nature of application.

Weight - Installation issues, recharging and frequency of removal.

Dimensions - Will it fit?

Maintenance Issues - Sealed for life verse top up.

Robustness - Extreme temperatures, vibration, shock, etc.

Venting - Facilities for venting gasses.

Terminal Type - Bolt though, screw down, SAE post, folded tag, bolt size.

Terminal Location - Top, side, top and side.

Terminal Orientation - Opposite ends, one end, etc.

Charging Requirements - Float, deep cycle, rate of charging.

Environment - Heat, chemicals, pressure.

Expect/Required Life - Remote location, critical application, low maintenance.

Nature Of Installation - Life critical, mission critical ... lawn mower, child's toy.

Handles - For lifting.

Safety - In part aided by correct battery specification.

Lead Time - Availability.