Prima
Description
This Prima YTX4L-BS AGM scooter battery delivers dependable starting power to help keep your daily rides on track. With 12V, 3Ah capacity and 50 cold cranking amps, it is a practical replacement for matching scooter battery applications. The included acid pack lets you activate it before use, and its absorbent glass mat (AGM) construction is maintenance-free once activated and sealed.
Key Features
- Reliable starting power: 50 CCA supports starting in compatible scooter applications.
- Maintenance-free AGM design: No routine electrolyte top-ups after proper activation and sealing.
- Fresh activation: Includes an acid pack; activate and charge before installation.
- Compact fit: A 4½ × 2¾ × 3½-inch case suits matching battery trays and hold-downs.
- Clear polarity: Negative terminal on the left and positive on the right when facing the labeled front.
Technical Specifications
- Brand: Prima
- Part number: B12K2
- Battery designation: YTX4L-BS
- Type: AGM lead-acid battery
- Voltage: 12V DC
- Capacity: 3Ah at the 10-hour rate
- Cold cranking amps: 50 CCA
- Dimensions: 4½ inches long × 2¾ inches wide × 3½ inches high
- Polarity: Left negative (-), right positive (+), facing the labeled front
- Cross-reference: Yuasa YT4L-BS
- Weight: 4 lb
- Includes: Battery and acid pack
- Country of origin: China
Compatibility
| Make | Models |
|---|---|
| Genuine | Buddy 50, RoughHouse 50, Black Cat 50, Rattler 50 |
| Vespa / Piaggio | ET2, S 50, Fly 50, Zip |
| Honda | Aero NB50, Elite 50 (S/SR/LX), Spree NQ50, Gyro TG50 |
| SYM / Lance | Fiddle 50, Mio 50, Cali Classic 50, Cabo 50 |
| Kymco / TGB | Kymco Cobra, People 150; TGB Laser 50, Key West 50 |
| Yamaha | Riva 50, Jog CY50 |
| Chinese 50/80cc scooters | Matching TaoTao, Wolf, Ice Bear and 139QMB-powered applications, including 139QMA/QMB, 1P39QMB, YN139QMB, JJ1P39QMB, BN139QMB and 147QMD |
Compare your original battery's voltage, capacity and cranking requirements, dimensions, terminal layout, and hold-down clearance before ordering. Model variants may use different batteries; an engine code alone does not determine battery fitment.
Activation required: Follow the supplied acid-pack and battery instructions, then fully charge with a compatible AGM battery charger before installation. For a pre-activated alternative, see the Prima Nanogel 12V YG4L-BS battery (0900-1115).
Shipping: US domestic ground only. Not available for international, expedited, Alaska, Hawaii, or Puerto Rico orders.
For winter storage or infrequent use, maintain the charge with a compatible NOCO Smart Battery Charger.
Product Diagrams
Features
Specifications
Brand: Prima; Part number: B12K2; Designation: YTX4L-BS; Type: AGM lead-acid; Voltage: 12V DC; Capacity: 3Ah at 10-hour rate; CCA: 50; Dimensions: 4.5 × 2.75 × 3.5 inches L × W × H; Polarity: left negative, right positive facing labeled front; Cross-reference: Yuasa YT4L-BS; Weight: 4 lb; Includes: battery and acid pack; Activation and charging required; Origin: China; Shipping: US domestic ground only, excluding AK, HI and PR
Model Fitments
Genuine Buddy 50 / RoughHouse 50 / Black Cat 50 / Rattler 50 | Vespa ET2 / S 50 / Fly 50 / Zip | Honda Aero NB50 / Elite 50 / Spree NQ50 / Gyro TG50 | SYM/Lance Fiddle 50 / Mio 50 / Cali Classic 50 / Cabo 50 | Kymco Cobra / People 150 / TGB Laser 50 / Key West 50 | Yamaha Riva 50 / Jog CY50 | Chinese 139QMB 50cc/80cc scooters
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
