2015–2021 Lexus NX
By Ray Delgado ✓ Certified Mechanic · Published Sep 21, 2026 · Updated Oct 22, 2026
Save $133 by doing it yourself! Shop cost: $280
Quick answer: Battery Replacement on a 2015–2021 Lexus NX 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
Follow these steps carefully
Turn the NX off and identify your model. Hybrids also have dedicated jump-start posts under a red cover in the engine-bay fuse box — handy if the battery is too dead to open the power tailgate.
On the engine-bay battery, loosen the 10mm nut on the black negative clamp and twist it free, keeping it clear of the post. Never pry a clamp with a screwdriver. If trim clips resist, pull them straight out than bending the panel.
I made this mistake once: Never pry a clamp with a screwdriver. It's the difference between a quick job and a comeback.
Loosen and lift off the red positive cable and set it where it cannot touch metal. Unbolt the hold-down — the NX uses a bracket and bolt arrangement at the battery base. Keep track of every bolt and clip you remove from the cargo trim.
Lift the battery straight up and out — around 40-plus pounds. Brush the tray or well clean and check the rubber drain or vent routing. Set the new battery in facing the same direction as the old one, terminals on the correct sides.
Wire-brush the clamps and posts to bright metal and apply a light coat of terminal protectant. Reinstall the hold-down bracket and tighten it so the battery is immobile. Then connect the positive (+) cable first and tighten, followed by the negative (−) last. On the NX300h, reattach the vent hose and refit the cargo trim panels, pressing each clip home.
Start the vehicle — on the hybrid, the ready light should come on without drama. Confirm no battery or hybrid-system warnings appear, then test headlights, power windows, and the tailgate.
Some late-model vehicles ask for the 12-volt battery to be registered with the battery control module, so check the owner's manual for your exact year rather than assuming. Never touch the orange high-voltage cables or the hybrid battery pack — this job covers the 12-volt auxiliary battery only.
I've watched people get this wrong: Never touch the orange high-voltage cables or the hybrid battery pack — this job covers the 12-volt auxiliary battery only.
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
2015–2021
2015–2021
2015–2021
2015–2021
2015–2021
2015–2021
Acura Integra · 2023–2026
Acura MDX · 2017–2021
Acura RDX · 2019–2024
Acura RSX · 2002–2006
Acura TL · 2009–2014
Acura TLX · 2015–2020
Acura TSX · 2004–2008
Alfa Romeo Giulia · 2017–2024
