Mighty Max Battery ML-U1-CCAHR 12V 320CCA Battery for Troy-Bilt 34343 350CCA Lawn Mower

What It Is

The Mighty Max Battery ML-U1-CCAHR is a 12V, 320 CCA (cold cranking amps) replacement battery designed for Troy-Bilt riding lawn mowers and tractors that originally spec a 350 CCA battery, such as the Troy-Bilt 34343. It’s a sealed, maintenance-free AGM (absorbent glass mat) battery, ideal for starting small engines in residential and light commercial mowers.

Fitment & Compatibility

Before buying, verify these three things:

• OEM Part Number: This battery directly replaces Troy-Bilt OEM part 34343 (350 CCA). Check your mower’s manual or current battery label for that number.
• Dimensions: The ML-U1-CCAHR measures 7.7 x 5.1 x 6.3 inches (L x W x H). Measure your battery tray to confirm it fits—many Troy-Bilt models use U1 size, but deck size or chassis variations can change clearance.
• Terminal Position: It has positive on the left, negative on the right (standard U1 layout). If your cables are reversed, you’ll need to extend or reroute them—not a direct swap.
• CCA Rating: 320 CCA is slightly below the original 350 CCA, but sufficient for most residential mowers in moderate climates. For cold-weather starts (below 30°F), consider a battery with at least 350 CCA.

Key Things to Know

• AGM vs. Wet Cell: This is AGM (absorbent glass mat)—spill-proof, vibration-resistant, and no water refills. It’s more durable than traditional flooded batteries but slightly more expensive.
• Installation Difficulty: Easy—disconnect old battery (negative first), swap, reconnect (positive first). No special tools beyond a 10mm wrench or socket. Takes 10–15 minutes.
• Common Gotcha: The 320 CCA rating is adequate for most Troy-Bilt engines (e.g., 17.5–24 HP Briggs & Stratton), but if your mower has a high-compression or cold-starting issue, this battery may struggle. Test your old battery’s CCA first with a multimeter or load tester.
• Warranty: Mighty Max typically offers a 1-year warranty. Register it online immediately—paperwork isn’t included in the box.

Should You Buy It

Buy this if you need a direct, drop-in replacement for a Troy-Bilt 34343 battery and your mower starts reliably in moderate temperatures. It’s a solid value for the price, with good vibration resistance and no maintenance. Skip it if you mow in sub-freezing conditions or have a high-compression engine that demands the full 350 CCA—those users should look for a 350+ CCA option.