TYKOOL YTX4L-BS YTZ5S Lithium Motorcycle Battery - Lightweight

In this review of the TYKOOL YTX4L-BS YTZ5S Lithium battery, the bottom line is simple: it is for riders and small-vehicle owners who want a lightweight, low-maintenance replacement for a small lead acid battery and reliable starting power. The reviewer found it comes fully charged and ready to install, with a built-in BMS and a clear advantage in weight and charge speed. If you value quick installation, steady cranking amps, and a battery that avoids acid and watering, this unit delivers most of those benefits right out of the box.

Key Features

• Ready to Install: Arrives fully charged so the battery can be fitted immediately without activation or acid handling.
• High Cranking Power: Rated at about 140 A cold cranking amperes to provide confident starting for scooters, small bikes, and ATVs.
• Long Cycle Life: Lithium LiFePO4 chemistry offers over 2500 charge cycles, promising a longer usable life than comparable lead acid units.
• Built-in Protection: Integrated BMS guards against overcharge, overdischarge, short circuit, and overcurrent for safer operation and storage.
• Fast Charging: Charges far faster than lead acid equivalents, reducing downtime between uses for seasonal or frequent riders.
• Compact and Light: At about 1.32 pounds and compact dimensions, it reduces overall vehicle weight and simplifies installation in tight battery bays.

Who It's For

The TYKOOL lithium replacement suits owners of small motorcycles, scooters, mopeds, go karts, ATVs, and walk-behind lawn mowers who want an easy drop-in swap for a YTX4L-BS or YTZ5S lead acid battery. It is especially useful for riders who prioritize quick starting, lighter weight, and low maintenance between seasons.

It is less appropriate for users who expect the absolute longest possible runtime for accessories without adding capacity or those who need batteries for very large-displacement motorcycles beyond the listed compatibility. Also, anyone who requires a battery with a significantly higher amp hour rating should consider a larger capacity model.

Pros & Cons

Pros

• Lightweight and compact, making installation easier in tight spaces.
• Strong cranking power for its size, providing reliable starts for small engines and powering LED lighting.
• Built-in BMS and long cycle life reduce maintenance and extend usable life compared with lead acid units.
• Fast recharge capability shortens downtime between uses.

Cons

• Lower 3 Ah capacity means limited reserve power for heavy accessory use without an upgrade.
• Some customers report mixed results on long term calendar life, so expect variation compared with much larger batteries.

Specifications

Model Fit	YTX4L-BS / YTZ5S replacements
Voltage	12.8 V
Capacity	3 Ah
Cold Cranking Amps	140 A
Weight	1.32 Pounds
Dimensions	4.44 x 2.7 x 3.34 in (L x W x H)
Protection	Built-in BMS: overcharge, overdischarge, short circuit, overcurrent

Our Verdict

The TYKOOL YTX4L-BS YTZ5S Lithium battery is a sensible upgrade for small motorcycles, scooters, and yard equipment that need a lightweight, maintenance-free starter battery with solid cranking power. It represents good value where reduced weight, fast charging, and a built-in BMS matter most, though buyers should match its 3 Ah capacity to their accessory needs.

Frequently Asked Questions

Does this battery arrive charged and ready to use?
Yes, it comes fully charged and ready to install with no acid or activation required.

Will it fit in a YTX4L-BS battery tray?
It is designed as a direct replacement for YTX4L-BS and similar sizes, but always check polarity and physical dimensions before installing.

Is the battery low maintenance?
Yes, the LiFePO4 chemistry and built-in BMS eliminate watering and routine equalizing, so maintenance is minimal.