The "VPH" series are the most popular Voltphreaks batteries. The main thing the battery needs to do is start the car. Once the engine is running, the alternator supplies the power. The chart below breaks up the various Voltphreaks models by the size of the recommended engine they can start.
These are general recommendations, what is best for you can depend on if you have a harder or easier to crank/start engine, if you use your car in a warm or cold climate, engine displacement, compression, etc.
|VPH750||most 6-cylinder engines,(Exige, most M3s and Porsches*), easier to start 8-cylinder engines||5.5 lbs, compares to 30 lbs+ lead-acid batteries|
|VPH900||8-cylinder and bigger engines, hard to start engines||7.0 lbs, compares to 50 lbs+ lead-acid batteries|
|VPHS40||Any application that requires the most power and capacity.||8.75 lbs, compares to 70 lbs+ lead-acid batteries|
|VPR series||If you want best power/capacity to weight ratio, check out the VPR series, the most popular model for track and professionals.||6.0 lbs|
* Note that some Porsche GT models may not properly charge the Voltphreaks battery, due to the alternator's voltage being too low. Click here for more information.