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.
Features
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Reliable starting power: 50 CCA supports starting in compatible scooter applications.
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Maintenance-free AGM design: No routine electrolyte top-ups after proper activation and sealing.
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Fresh activation: Includes an acid pack; activate and charge before installation.
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Compact fit: A 4½ × 2¾ × 3½-inch case suits matching battery trays and hold-downs.
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Clear polarity: Negative terminal on the left and positive on the right when facing the labeled front.
Specifications
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Brand: Prima
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Part number: B12K2
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Battery designation: YTX4L-BS
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Type: AGM lead-acid battery
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Voltage: 12V DC
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Capacity: 3Ah at the 10-hour rate
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Cold cranking amps: 50 CCA
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Dimensions: 4½ inches long × 2¾ inches wide × 3½ inches high
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Polarity: Left negative (-), right positive (+), facing the labeled front
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Cross-reference: Yuasa YT4L-BS
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Weight: 4 lb
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Includes: Battery and acid pack
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Country of origin: China
Model Fitment
| 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.
