AL10 Generation (2010–2015)
2012 Lexus RX Battery Size & Specs
BCI Group Size
Group H6 (48) / Group 35
Cold Cranking Amps
650 CCA
Chemistry / Type
Standard Flooded Lead-Acid
Hold-Down Torque
3.5 to 4.5 ft-lbs (40 to 54 in-lbs / 5 to 6 Nm)
Factory OEM Battery Specifications
| BCI Group Size | Group H6 (48) / Group 35 |
|---|---|
| Minimum Cold Cranking Amps | 650 CCA (0°F / -18°C) |
| Cranking Amps at 32°F | 812 CA |
| Terminal Configuration | SAE Automotive Top Post — Right Positive (+) |
| Tray Dimensions (L x W x H) | 11.0 x 6.9 x 7.5 in |
| Bracket Bolt Socket Size | 10mm socket |
| Hold-Down Clamp Torque | 3.5 to 4.5 ft-lbs (40 to 54 in-lbs / 5 to 6 Nm) |
| Estimated DIY Retail Cost | $150 to $220 |
Recommended Replacement Batteries & Tools
OEM Replacement
Group H6 (48) / Group 35 Premium Battery
Direct-fit BCI Group H6 (48) / Group 35 replacement battery engineered with 650 minimum cold cranking amps for reliable starting.
Check Price on Amazon →
Battery Care
Smart 12V Battery Maintainer
Automatic multi-stage smart charger that prevents parasitic drain, recovers deeply discharged cells, and extends AGM battery life.
View Charger on Amazon →
Installation Kit
Terminal Cleaner & Protectant
Professional corrosion preventative spray and wire post brush kit to guarantee zero electrical resistance on battery terminals.
View Spray on Amazon →SelectMyBlog participates in affiliate programs and may earn commissions from qualifying purchases.
Step-by-Step Battery Replacement Procedure
Replacing the 12-volt battery on the 2012 Lexus RX requires standard hand tools and adherence to electrical safety protocols:
- Step 1 (Safety Isolation): Turn off the ignition, set the parking brake, and remove the key fob. Wear ANSI-approved safety glasses and insulated work gloves.
- Step 2 (Negative Disconnect First): Use a 10mm wrench to loosen the Negative (Black / Minus) terminal clamp nut. Twist and lift the clamp clear of the terminal post to break chassis ground.
- Step 3 (Positive Disconnect Second): Loosen the Positive (Red / Plus) terminal clamp nut and secure the cable safely aside.
- Step 4 (Hold-Down Bracket Removal): Unbolt the 10mm base clamp hold-down bracket and lift the old battery vertically out of the vehicle tray.
- Step 5 (Tray Cleaning & Seating): Scrape corrosive acid deposits from the tray using a wire brush. Lower the new Group H6 (48) / Group 35 battery into place.
- Step 6 (Torque & Reconnection): Secure the hold-down clamp to 3.5 to 4.5 ft-lbs (40 to 54 in-lbs / 5 to 6 Nm). Reconnect the Positive (+) terminal first, then the Negative (-) terminal last.
Frequently Asked Questions
What battery size does a 2012 Lexus RX take?
The 2012 Lexus RX requires a BCI Group H6 (48) / Group 35 12-volt battery with a minimum rating of 650 Cold Cranking Amps (CCA).
Does this vehicle require an AGM or standard flooded battery?
Standard Flooded Lead-Acid. If equipped with engine start-stop technology, an AGM battery is mandatory to support continuous micro-cycling.
Why must the negative battery terminal be disconnected first?
Disconnecting the negative cable first eliminates the danger of an electrical short circuit if a metal tool accidentally touches the vehicle metal chassis while loosening the terminal.
How long does a 12V car battery last?
Most automotive batteries last between 3 to 5 years depending on climate, daily driving distance, and alternator charging performance. High ambient heat accelerates grid corrosion.