i have just tested my bike today with the ping 24 volt 20 amp version 2.5 battery i was really surprised how well it went and after using the bike for over 12 miles with little pedaling i never even used half the battery pack my watts up meter was showing 7.5 amps used and its about right as it took the ping just over 1.5 hours to charge with my 5 amp charger they say the pings get better after a few charges so i hope to get 30 miles from my ping which is great i will be selling my psi 24 volt 10 amp pack that came with my cyclone kit if anyone wants it and is in the uk let me know