Electric booser folding bike 1000W 500W 250W 36V 10Ah 36V 20Ah 48V 10Ah little frog battery seat tube battery pack for mtb bike Electric booser folding bike 1000W 500W 250W 36V 10Ah 36V 20Ah 48V 10Ah little frog battery seat tube battery pack for mtb bike. Sale price : $123.55 Category : Sports & Entertainment