just pasted this from the trakpower site. basically you get 100 top race performances the 200 practice (club night ) either way once you,ve felt the differance in your car you wont go back. I got the muchmore silent ac/dc charger from dinball £77 inc postage and a must have charging bag £9.99 local model shop. Make sure you have a updated esc that has a voltage cut off of 6.25v built in as if lipo,s dip under 6v they are goosed. if you have older esc then use a novak smart stop this will save your lipo,s
http://www.trakpower.com/ check out the other batteries
World’s highest performance 10th scale hard-case LiPo battery.
Trakpower specific cell type developed purely for racing.
100% factory matched cells for IR, Capacity and Voltage
Meets and exceeds ROAR Sanctioning requirements.
TrakPower-exclusive embedded gold terminals.
Wide area ultrasonic tab-welding.
Lowest IR ever recorded in a finished racing pack.
4.4mOhm typical at the terminals!
Terminals mate with Sermos, Corally, or standard 4mm Gold-Bullet connectors.
48% higher mass energy density than the very best NiMH/NiCd.
100+ race-worthy cycles with simple maintenance
Massive run-times, up to 23 minutes recorded on carpet.
Maintains 7.4V+ flat-line under typical racing loads, for consistent power and precise control.
No memory-effect, can be part-charged at the track as required without need for deep discharge cycling.
2C fast charging (with V-Balance recommended)
100+ race-worthy cycles, 200+ for practice.
Typically 25%-35% of capacity used for each race, charge times are short even with 1C charging.
Extremely slow self-discharge, can be charged days or weeks ahead of use.
Easy to charge and maintain in peak condition with a simple LiPo charger/balancer combination
Eliminates complex charging routines.
TrakPower comes from the same stable as FlightPower, technical and market leaders in LiPo for RC Flight market.
Slot-in replacement for the vast majority of chassis designed for 6-cell Sub-C NiCd / NiMH
TrakPower V-Balance system available for plug and play maintenance, performance-optimization and charge-safety.
TrakPower Pit Pro 550 Li charger, fully compliant low-cost high quality 5Amp charger available for a painless transition to the new power-source for RC Motorsport.