Make the car lighter in one swap
Remove 30+ pounds without changing the seats, wheels, or interior. You simply replace the battery you already have.
A lighter, smarter battery for cars that use Group 35 / Q85
A lighter battery with backup starting power built in
Save 30+ pounds, check the battery from your phone, and use built-in backup starting power if the main charge gets too low.
- Dependable for everyday driving
- Backup starting power when you need it
- See charge and health in the phone app
- Designed to handle more starts and recharges
- Covered by a 5-year prorated warranty
- Free shipping in the lower 48 states
Battery size name35 / Q85
Battery dimensions9.4 × 6.9 × 8.7 in
Battery weight15.4 lb
Power to start the car910 CA
Not sure what Group 35 / Q85 means? Look at the label on your current battery or check your owner's manual. It is simply the standard size and terminal layout your car expects.
Battery + PowerTex app
PowerTex Batteries BCI Group 35 / Q85 Lithium LiFePO4 Automotive Battery
$874.99
Take one minute to make sure it fits. Compare the size and connections with your current battery, then use the simple checklist below.
Extra starting power is waiting
If the main battery charge gets too low, the built-in reserve can give you another chance to start the car instead of leaving you stranded.
Know before you turn the key
Open the PowerTex app to see how much charge is left and whether the battery is healthy—without guessing or opening the hood.
Covered for five years
The automotive warranty is prorated for five years, with PowerTex support if you need help.
PowerTex phone app
Check your battery before it becomes a surprise
Connect with Bluetooth and open the PowerTex app whenever you want a quick answer: Is the battery charged? Is it healthy? Is anything unusual happening? No tools and no lifted hood required.
- See how much charge is left
- Check battery health and temperature
- Understand how the battery has been used over time
- Turn on backup starting power from your phone if the main power shuts off
Longer service life
Buy once. Replace less often.
Regular lead-acid batteries wear down as they are drained and recharged. PowerTex lithium batteries are designed to handle that repeated use much better, which can mean a longer useful life when the battery is installed and cared for correctly.
- Handles repeated charging better than a typical lead-acid battery
- Built-in safeguards help prevent common causes of battery damage
- The phone app shows how the battery is being used over time
How long any battery lasts depends on the car, weather, charging system, storage, and electrical drain while parked.
Before ordering
Make sure it fits in about two minutes
No battery expertise needed. Compare these four things with the battery already in your car.
- 1. Find the size name Look for Group 35 / Q85 on the old battery label or in your owner's manual.
- 2. Compare the case size This battery is 9.4 × 6.9 × 8.7 in. Compare its length, width, and height with your current battery.
- 3. Check the posts and cables Make sure the positive post is on the same side and both cables reach without stretching.
- 4. Check how it is held down Make sure your factory bracket can hold the new battery firmly so it cannot move.
If anything looks different—or your car has extra wires, a vent tube, or a battery sensor—ask us before ordering.