Lithium Motorcycle Battery YTX9-BS/YTX7A-BS - Pre-Charged 12V 4Ah

In this review the KEMIMOTO Lithium Motorcycle Battery YTX9-BS/YTX7A-BS is evaluated as a lightweight, pre-charged replacement for small powersports lead-acid batteries. The bottom line: riders and powersports owners who want a fast-charge, long-life LiFePO4 unit that drops several pounds and starts reliably will appreciate this battery; the single biggest reason to buy is the combination of pre-charged convenience and high cold cranking capability that lets you install and start without first charging. The review highlights fit options, installation choices, and practical tradeoffs observed in real use.

Key Features

• Pre-charged and ready: The battery arrives pre-charged with a power display so most vehicles start without an initial charger session.
• High discharge capability: Pure copper terminals and 320A cold cranking capability deliver strong starting power for motorcycles and small ATVs.
• Adjustable fit: Three universal EVA spacers and threaded-lug posts provide several mounting options to match YTX7A-BS or YTX9-BS sizes.
• Long-lived LiFePO4 chemistry: The battery is much lighter than lead-acid, charges faster, and is rated for a lengthy cycle life for frequent use.
• BMS protection: Built-in management cuts out at extreme temperatures to protect the pack and connected electronics.

Who It's For

This battery is aimed at riders who want to reduce weight and improve starting reliability on motorcycles, ATVs, UTVs, jet skis, scooters and other small powersports vehicles. It is a good match for users who value fast charging, long cycle life and the convenience of a pre-charged unit that can be fitted quickly using the included spacers.

Those who should look elsewhere include people who cannot match the amp rating exactly to their original battery or who need a sealed lead-acid replacement for specific legacy chargers or vehicle systems. Also check fit and terminal orientation carefully if your battery bay is tight or uses uncommon mounting hardware.

Pros & Cons

Pros

• Substantial weight reduction compared with lead-acid, making handling and cornering marginally better.
• Pre-charged and supports immediate installation without a separate charger in most cases.
• Adjustable EVA spacers and threaded terminals simplify installation across YTX7A-BS and YTX9-BS form factors.
• Robust BMS and LiFePO4 chemistry deliver long cycle life and safer charge/discharge behavior.

Cons

• Some users report mixed longevity in field reports, so early failure has been noted anecdotally and is a realistic concern.
• Must match amp rating exactly to the original battery to avoid safety or compatibility issues.

Specifications

Brand	KEMIMOTO
Chemistry	LiFePO4 (Lithium)
Voltage	12V
Capacity	4Ah
Cold Cranking Amps	320A
Mounting	3 EVA spacers, threaded-lug posts
Included	Battery, 2 screws, 3 EVA spacers, user manual

Our Verdict

The KEMIMOTO LiFePO4 12V 4Ah battery is a practical, value-minded replacement for riders who want lighter weight, fast charging and reliable starting power without pre-charging. It offers useful mounting flexibility and strong BMS protections, making it good value for most motorcycles, ATVs and PWC applications, though buyers should verify amp match and be aware that a small number of users report premature failures in isolated cases.

Frequently Asked Questions

Do I need a charger to use this battery?
The battery ships pre-charged and typically will start a vehicle without an initial charger, but you should verify the built-in power display and charge level before installation.

Will it fit my YTX7A-BS or YTX9-BS battery tray?
Yes, it includes three universal EVA spacers and threaded-lug posts to adapt to YTX7A-BS and YTX9-BS style mounts, but confirm terminal orientation and physical clearance.

Is this safe in extreme temperatures?
Yes, the integrated BMS will cut out under extreme low or high temperature conditions to protect the battery and connected electronics.