---
title: "2020-2024 Tesla Model Y Battery Size and CCA"
description: "The 2020-2024 Tesla Model Y uses a BCI group 85B24LS (JIS) 12V lead-acid, early builds only; see notes battery. Fitment, replacement notes, and what to check before you buy."
url: "https://whichcarparts.com/cars/tesla/model-y/2020-2024/battery"
updated: "2026-08-20"
---

# 2020-2024 Tesla Model Y Battery Size (BCI Group and CCA)

The 2020-2024 Tesla Model Y uses a BCI group 85B24LS (JIS) 12V lead-acid, early builds only; see notes battery. Fitment, replacement notes, and what to check before you buy.

**Quick answer**: The 2020-2024 Tesla Model Y uses a Group 85B24LS (JIS) 12V lead-acid, early builds only; see notes battery.

## 2020-2024 Tesla Model Y battery specifications (High confidence)

| Spec | Value |
| --- | --- |
| BCI group size | 85B24LS (JIS) 12V lead-acid, early builds only; see notes |
| AGM required | No |
| Location | Front trunk area, under the plastic underhood apron |

Note: This is the low-voltage accessory battery, not the high-voltage pack. Vehicles built from launch through roughly late 2021 use a conventional AtlasBX/Hankook 85B24LS 12V 45Ah lead-acid battery (Tesla publishes a DIY replacement procedure; it lives under the front trunk apron). Vehicles built from approximately December 2021 onward (most 2022+ model years) instead use a Tesla-proprietary ~15.5V lithium-ion low-voltage battery that is far longer-lived but is a Tesla-service-only part. Check yours: a Li-ion car shows ~15-16V system voltage in service mode; when in doubt look at the battery label. Lead-acid cars commonly need a new 12V every 2-4 years, replace like-for-like; the car warns on screen when the battery is weak.

## Which Tesla Model Y model years does this cover?

These battery specifications apply to every Tesla Model Y built from 2020 through 2024, the 1st generation (original body), compact electric crossover suv (5- or 7-seat). Nothing in this specification changes between those model years.

- [2020 Model Y](https://whichcarparts.com/cars/tesla/model-y/2020)
- [2021 Model Y](https://whichcarparts.com/cars/tesla/model-y/2021)
- [2022 Model Y](https://whichcarparts.com/cars/tesla/model-y/2022)
- [2023 Model Y](https://whichcarparts.com/cars/tesla/model-y/2023)
- [2024 Model Y](https://whichcarparts.com/cars/tesla/model-y/2024)

## What changed during the 2020-2024 Tesla Model Y

| Years | What changed |
| --- | --- |
| 2020 | US deliveries began March 2020 with Long Range AWD and Performance only. 12V lead-acid battery; no HEPA filter. |
| 2021 | Standard Range RWD sold January-February 2021 only (244 mi); 7-seat option added; late-2021 builds gained the ~16V lithium-ion low-voltage battery and (from ~2022 production) the HEPA filter |
| 2022 | Austin-built Standard Range AWD with 4680 structural pack begins (limited availability); AMD Ryzen infotainment replaces Intel Atom during the year |
| 2023 | 4680 Standard Range AWD sold publicly April-September; last full year of the original body |
| 2024 | RWD base model (260 mi, software-limited) from October 2023; renamed/unlocked to Long Range RWD (320 mi) in May 2024. Some carryover legacy cars were also titled as early 2025s |

## 2020-2024 Tesla Model Y battery: common questions

### What size battery does a 2020-2024 Tesla Model Y take?

BCI group 85B24LS (JIS) 12V lead-acid, early builds only; see notes. 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 2020-2024 Tesla Model Y?

Front trunk area, under the plastic underhood apron.

### Does a 2020-2024 Tesla Model Y need the battery registered after replacement?

This is the low-voltage accessory battery, not the high-voltage pack. Vehicles built from launch through roughly late 2021 use a conventional AtlasBX/Hankook 85B24LS 12V 45Ah lead-acid battery (Tesla publishes a DIY replacement procedure; it lives under the front trunk apron). Vehicles built from approximately December 2021 onward (most 2022+ model years) instead use a Tesla-proprietary ~15.5V lithium-ion low-voltage battery that is far longer-lived but is a Tesla-service-only part. Check yours: a Li-ion car shows ~15-16V system voltage in service mode; when in doubt look at the battery label. Lead-acid cars commonly need a new 12V every 2-4 years, replace like-for-like; the car warns on screen when the battery is weak.

## Sources

- [Tesla Model Y Owner's Manual, Wheels and Tires (sizes, lug torque)](https://www.tesla.com/ownersmanual/modely/en_us/GUID-FDDB10EF-FFA9-46EB-B8CC-03614AE92B6B.html)
- [Tesla DIY, Replacing Cabin Air Filters (Model Y)](https://service.tesla.com/docs/Public/diy/modely/en_us/GUID-1C689042-6645-4617-B270-7F2DA9A5624E.html)
- [Tesla DIY, Replacing Wiper Blades (Model Y, 26/20 in)](https://service.tesla.com/docs/Public/diy/modely/en_us/GUID-949BFDA4-8D73-43A6-AAA5-98AE1129AC25.html)
- [Tesla DIY, Replacing the Low Voltage Lead-Acid Battery (85B24LS 12V 45Ah)](https://service.tesla.com/docs/Public/diy/modely/en_us/GUID-AE762FFF-8268-4BDF-9246-A2BB8D17B0B4.html)
- [Tesla Support, Vehicle Maintenance (official intervals)](https://www.tesla.com/support/car-maintenance)
- [Tesla Model Y Service Manual, Brakes (rotor diameters)](https://service.tesla.com/docs/ModelY/ServiceManual/en-us/GUID-3B4A23E8-4440-4701-9092-5A3F83639F47.html)
- [NHTSA recall lookup, Tesla Model Y 2020-2024 (all campaign numbers)](https://www.nhtsa.gov/vehicle/2021/TESLA/MODEL%252520Y/SUV/AWD)
- [Car and Driver, 2020 Model Y Long Range AWD specs (curb weight, towing, hp)](https://www.caranddriver.com/tesla/model-y/specs/2020/tesla_model-y_tesla-model-y_2020)
- [Wikipedia, Tesla Model Y (US variant timeline, 4680 AWD, RWD unlock)](https://en.wikipedia.org/wiki/Tesla_Model_Y)
- [Tesla Shop, Model 3/Y cabin air filter (two required)](https://shop.tesla.com/product/model-3_y-air-filter)

## Other Tesla Model Y generations

- [2025 Tesla Model Y battery](https://whichcarparts.com/cars/tesla/model-y/2025/battery)

Or [compare all generations](https://whichcarparts.com/cars/tesla/model-y/battery).

## More for the 2020-2024 Tesla Model Y

- [Oil & filter](https://whichcarparts.com/cars/tesla/model-y/2020-2024/oil)
- [Tires & wheels](https://whichcarparts.com/cars/tesla/model-y/2020-2024/tires)
- [Wiper blades](https://whichcarparts.com/cars/tesla/model-y/2020-2024/wipers)
- [Air & cabin filters](https://whichcarparts.com/cars/tesla/model-y/2020-2024/filters)
- [Bulbs](https://whichcarparts.com/cars/tesla/model-y/2020-2024/bulbs)
- [Brakes](https://whichcarparts.com/cars/tesla/model-y/2020-2024/brakes)
- [Fluids](https://whichcarparts.com/cars/tesla/model-y/2020-2024/fluids)
- [Service schedule](https://whichcarparts.com/cars/tesla/model-y/2020-2024/service-schedule)
- [Problems & reliability](https://whichcarparts.com/cars/tesla/model-y/2020-2024/common-problems)
- [Key fob battery](https://whichcarparts.com/cars/tesla/model-y/2020-2024/key-fob-battery)
- [Specs](https://whichcarparts.com/cars/tesla/model-y/2020-2024/specs)

Specifications vary with engine option, production date, and market.