Body
Safety first
A 12V battery can spark, leak acid, and short. Wear eye protection/gloves, work ventilated with no flame, and keep tools from bridging positive to ground. Never tip a flooded battery; neutralize spills with baking soda/water and recycle it. If swollen, cracked, or frozen, use a shop. EZ Car Fix is informational DIY only.
What you need
Correct group size/terminal layout/CCA battery; 10mm wrench; terminal brush; baking soda/water; optional grease, memory saver, and good hold-down.
Related guide: 2006-2011 Honda Civic - Battery Replacement — Vehicle-specific battery replacement walkthroughs with the full job steps.
Steps
Park level, engine off, brake on. Photograph + (usually red) and - (usually black) cables. Optionally connect a memory saver. Remove negative first, then positive; remove hold-down and lift carefully. Clean corrosion and inspect cables. Set the new battery with correct polarity and secure the hold-down. Connect positive first, negative last without overtightening. Start and check connections; recycle the old battery.
Aftercare
Some cars need window or throttle relearns. If slow cranking continues, test alternator and grounds. Avoid positive-first removal, loose hold-downs, wrong group size, and treating an overnight drain as a bad battery. Use a shop for unsafe access, welded terminals, or hybrid/EV high-voltage systems; this is for conventional 12V batteries.
Related guide: 2019-2024 Volkswagen Jetta - Jump Start — If the battery is just drained rather than dead, a jump start may be all it needs.
Related guide: 2017-2021 Acura MDX - Alternator Replacement — If slow cranking continues after a new battery, the alternator is the next suspect.
FAQ
Is DIY safe? Usually yes on conventional 12V systems with eye protection, correct order, and secure mounting; stop if damaged or unsafe.
Which cable first? Negative off first; positive on first.
Will presets be lost? Maybe; use a memory saver and have codes ready.
How choose a battery? Match group size, terminals, CCA, and specified reserve capacity via the manual or parts lookup.
Why did it die overnight? Check connections, battery fit, and for a parasitic drain instead of repeatedly replacing batteries.
