Quick answer: Battery Replacement on a 2019–2024 Lexus ES is rated Easy and takes about 15–25 minutes. You'll need 4 tools for this job, and parts cost about $147. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name |
Part Number |
Price |
Buy |
| Correct group-size battery |
— |
$140.00 |
|
| Terminal cleaner Optional |
— |
$8.00 |
|
| Terminal protectant |
— |
$7.00 |
|
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Step-by-Step Instructions
Follow these steps carefully
1
Locate the 12-volt battery for your ES
Shut the ES off completely. This guide covers the 12-volt battery only — the hybrid's high-voltage traction battery is a separate, dealer-only component you should never touch.
🔧 Mechanic's note — Ray Delgado
I keep a mental note on this one: This guide covers the 12-volt battery only — the hybrid's high-voltage traction battery is a separate, dealer-only component you should never touch.
2
Disconnect the negative terminal first
Using a 10mm wrench, loosen the nut on the black negative clamp and twist the cable off the post. On the ES300h, pull back the trunk trim on the right side to reach the battery first. Keep the loose cable end away from the post — drape it over the fender or tuck it behind a hose. Do not lever the clamp off with a metal tool.
🔧 Mechanic's note — Ray Delgado
I tell every DIYer who'll listen: Do not lever the clamp off with a metal tool. I check twice on these.
3
Remove the positive cable and the hold-down
Loosen and remove the red positive (+) cable, keeping it clear of every metal surface. Unbolt the hold-down bracket at the base of the battery and lift it out. On hybrid models, unclip the vent hose and any small sensor connectors before you try to lift — yanking the battery with the vent still attached cracks the fitting.
🔧 Mechanic's note — Ray Delgado
I've watched people get this wrong: On hybrid models, unclip the vent hose and any small sensor connectors before you try to lift — yanking the battery with the vent still attached cracks the fitting.
4
Swap the battery
Set the new battery in with the terminals on the same sides as before, reinstall the hold-down bracket, and tighten it until the battery cannot rock at all.
5
Clean, protect, and reconnect in order
Wire-brush the inside of each clamp and the battery posts to bright metal, then apply a light film of terminal protectant spray. Reattach the vent hose on trunk-mounted batteries — it routes gases safely outside the car.
6
Power up and test
A fresh 12-volt battery also cures the mysterious no-ready and warning-light cascades that hybrids throw when the little auxiliary battery gets weak. Test headlights, climate control, and the power trunk.
7
Relearns and owner's manual check
Some model years ask for the new 12-volt battery to be registered with the vehicle's computer, so check the owner's manual for your exact year instead of assuming. If warning lights persist beyond a day, have a Lexus shop scan the car.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Searching the engine bay on an ES300h — its 12-volt battery is in the trunk on the right side
- • Pulling the battery with the vent hose still attached and breaking the fitting
- • Reconnecting the negative cable before the positive
- • Ignoring the owner's manual on whether the new battery needs registering with the computer
