Does a sodium ion battery really last 3 times longer than lead acid?

Yes, based on cycle count. At 3,000 or more cycles versus 300 to 500 for lead acid, sodium ion delivers at minimum 3 times the cycle life, and often closer to 8 to 10 times in daily use once you account for lead acid's faster real world degradation in heat.

Does sodium ion battery life drop off in Australian summer heat?

Less than lead acid or lithium. SaltyCells batteries are rated for discharge up to 70°C, which covers the inside of an engine bay parked in direct sun in any Australian capital or outback town.

Do I need to trickle charge a sodium ion battery like a lead acid one?

No. Sodium ion does not sulfate from sitting idle, so there is no maintenance charging required for a car that only gets driven occasionally.

Will a 3,000 cycle rating mean exactly 3,000 days of use?

Not quite. One cycle is roughly one full discharge and recharge. Daily driving in a normal car uses less than a full cycle most days, so 3,000 cycles typically stretches to 8 to 10 years of real calendar time.

What warranty backs that cycle life claim?

SaltyCells batteries carry a 5 year manufacturer warranty, and are rated for at least 3,000 cycles at 60 percent depth of discharge.

How Long Does a Sodium Ion Battery Last?

How long does sodium ion battery last? 3,000+ cycles and a 5 year warranty in real Australian conditions. Here is the honest answer.