There are lead-acid (standard, AGM, or gel), lithium-ion, and other types. Lead-acid batteries are more affordable and proven, but heavier and have a shorter lifespan. Lithium-ion batteries are lighter, last longer, and offer more charge cycles, but require precise charging control.

Consider the voltage (usually 12 V), capacity (Ah), cold cranking amps, size, mounting type, and resistance to vibration and moisture.

Signs include voltage drop under load, inability to hold charge, reduced runtime, electrolyte leakage, corroded terminals, or excessive self-discharge.

Yes, but it should be stored fully charged and periodically recharged. Avoid deep discharges and low temperatures to prevent cell damage.

Avoid deep discharges, use a charger with maintenance mode, protect it from heat and vibration, clean the terminals, and monitor electrolyte levels (for serviceable types).