Tesla Model 3 · 2017–2025
Tesla Model 3 Battery Size (BCI Group and CCA)
The specification is not the same across every year we cover, the table below shows exactly where it changes.
Last verified
Has the Tesla Model 3 battery specification changed by year?
| Model years | Group size | CCA | Type | Location |
|---|---|---|---|---|
| 2024–2025 | Group 16V Li-ion low-voltage battery (Tesla proprietary, 15.5 V / 6.9 Ah) | N/A | N/A | Front compartment, behind the cabin-intake trim panel |
| 2017–2023 | Group 85B24LS (JIS; 12V 45 Ah) through ~Nov 2021 production; 16V Li-ion after | N/A | FLOODED | Front compartment, behind the cabin-intake trim panel at the base of the windshield |
Each row links to the full specification for that generation, including trim-by-trim breakdowns and the part numbers. Where engines within a generation differ, that page separates them.
Full specifications by generation
The battery on a Tesla Model 3 is set by its generation, not its model year, so each generation has one page carrying the complete figures, part numbers and fitment notes for every year it covers.
Tesla Model 3 battery: common questions
What size battery does a Tesla Model 3 take?
- BCI group 16V Li-ion low-voltage battery (Tesla proprietary, 15.5 V / 6.9 Ah). Group size is a physical dimension and terminal-position standard, so a battery from a different group may not clamp down or may put the terminals on the wrong side.
Where is the battery on a Tesla Model 3?
- Front compartment, behind the cabin-intake trim panel.
Does a Tesla Model 3 need the battery registered after replacement?
- All Highland cars use the 16V Li-ion low-voltage battery (CATL prismatic cells), no lead-acid option, no BCI group size, and Tesla says it is designed to last the life of the vehicle. Not a routine wear item; replacement is by Tesla (mobile) service. The high-voltage traction pack is separate.
Sources
- Tesla Support, Vehicle Maintenance (Model 3 intervals: cabin filter 2 yr, brake fluid 4 yr, rotation 6,250 mi, no desiccant for heat-pump cars)
- Wheel-Size.com, 2024 Tesla Model 3 OE fitments and 42 psi pressures
- Mavis, 2025 Model 3 Performance staggered OE sizes (235/35R20 front, 275/30R20 rear)
- NHTSA Part 573 report, recall 25V-002 (vehicle computer / rearview camera)
- NHTSA Part 573 report, recall 24V-376 (seat belt reminder)
- NHTSA Part 573 report, recall 24V-935 (TPMS warning light)
- Tesla Shop. Model 3 wiper blade (fits all Model 3 years)
- Tesla DIY Guide, Replacing Cabin Filters (procedure shared with pre-Highland cars)
- Wikipedia, Tesla Model 3 (Highland launch timing, curb weights, EPA ranges)
Find your exact Model 3
Jump to a model year for the engines it offered, what changed, and the problems documented against it: