--- title: "Tesla Model 3 Battery Size and CCA" description: "How the Tesla Model 3 battery specification changed from 2017 to 2025, compared generation by generation. The Tesla Model 3 uses a BCI group 16V Li-ion low-voltage battery (Tesla proprietary, 15.5 V / 6.9 Ah) battery. Fitment, replacement notes, and what to check before you buy." url: "https://whichcarparts.com/cars/tesla/model-3/battery" updated: "2026-08-20" --- # 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. ## Has the Tesla Model 3 battery specification changed by year? | Model years | Group size | CCA | Type | Location | | --- | --- | --- | --- | --- | | [2024-2025](https://whichcarparts.com/cars/tesla/model-3/2024-2025/battery) | 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](https://whichcarparts.com/cars/tesla/model-3/2017-2023/battery) | 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 | ## 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. - [2024-2025 Tesla Model 3 Battery](https://whichcarparts.com/cars/tesla/model-3/2024-2025/battery) - [2017-2023 Tesla Model 3 Battery](https://whichcarparts.com/cars/tesla/model-3/2017-2023/battery) ## 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)](https://www.tesla.com/support/vehicle-maintenance) - [Wheel-Size.com, 2024 Tesla Model 3 OE fitments and 42 psi pressures](https://www.wheel-size.com/size/tesla/model-3/2024/) - [Mavis, 2025 Model 3 Performance staggered OE sizes (235/35R20 front, 275/30R20 rear)](https://www.mavis.com/vehicle/tesla/model-3/2025/performance/) - [NHTSA Part 573 report, recall 25V-002 (vehicle computer / rearview camera)](https://static.nhtsa.gov/odi/rcl/2025/RCLRPT-25V002-6930.PDF) - [NHTSA Part 573 report, recall 24V-376 (seat belt reminder)](https://static.nhtsa.gov/odi/rcl/2024/RCLRPT-24V376-3527.PDF) - [NHTSA Part 573 report, recall 24V-935 (TPMS warning light)](https://static.nhtsa.gov/odi/rcl/2024/RCLRPT-24V935-1846.PDF) - [Tesla Shop. Model 3 wiper blade (fits all Model 3 years)](https://shop.tesla.com/product/model-3-wiper-blade) - [Tesla DIY Guide, Replacing Cabin Filters (procedure shared with pre-Highland cars)](https://service.tesla.com/docs/Public/diy/model3/en_us/GUID-DB0A1E3C-926E-498C-A2FD-A27B8421A471.html) - [Wikipedia, Tesla Model 3 (Highland launch timing, curb weights, EPA ranges)](https://en.wikipedia.org/wiki/Tesla_Model_3) ## Find your exact Model 3 - [2025](https://whichcarparts.com/cars/tesla/model-3/2025) - [2024](https://whichcarparts.com/cars/tesla/model-3/2024) - [2023](https://whichcarparts.com/cars/tesla/model-3/2023) - [2022](https://whichcarparts.com/cars/tesla/model-3/2022) - [2021](https://whichcarparts.com/cars/tesla/model-3/2021) - [2020](https://whichcarparts.com/cars/tesla/model-3/2020) - [2019](https://whichcarparts.com/cars/tesla/model-3/2019) - [2018](https://whichcarparts.com/cars/tesla/model-3/2018) - [2017](https://whichcarparts.com/cars/tesla/model-3/2017) More Tesla Model 3 guides: - [Oil & filter](https://whichcarparts.com/cars/tesla/model-3/oil) - [Tires & wheels](https://whichcarparts.com/cars/tesla/model-3/tires) - [Wiper blades](https://whichcarparts.com/cars/tesla/model-3/wipers) - [Air & cabin filters](https://whichcarparts.com/cars/tesla/model-3/filters) - [Bulbs](https://whichcarparts.com/cars/tesla/model-3/bulbs) - [Brakes](https://whichcarparts.com/cars/tesla/model-3/brakes) - [Fluids](https://whichcarparts.com/cars/tesla/model-3/fluids) - [Service schedule](https://whichcarparts.com/cars/tesla/model-3/service-schedule) - [Problems & reliability](https://whichcarparts.com/cars/tesla/model-3/common-problems) - [Key fob battery](https://whichcarparts.com/cars/tesla/model-3/key-fob-battery) - [Specs](https://whichcarparts.com/cars/tesla/model-3/specs) Specifications vary with engine option, production date, and market.