Start Pac introduces the first Lithium battery GPU, Model Li2800QC Li2600QC and the Li2000QC. The latest in iron phosphate technology, the same that plug in electric cars are using, comprises this revolutionary product. These batteries provide equal power as the lead-acid version but are 42 percent lighter and 33 percent smaller. In addition, Start Pac Li2800QC has two other major advantages: twice the battery life of lead-acid batteries.No sulfation problems (this unit can be left in a completely discharged state without causing damage to the batteries). Start Pac Li2800QC is a full 28VDC battery pac and will provide superior starts on all electrically started piston or turbine engines. It also has dual, redundant chargers with a total of 7 amps output and a recharge time of approximately four hours. The smaller units are 24 and 26 volts.