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=== Drivetrains ===
At introduction, the Catalyst was equipped with a single electric traction motor, the [[UQM Technologies]] HD220.<ref name=Altoona-BE40/><ref>{{cite press release |url=https://www.uqm.com/English/news/News/press-releases/press-release-details/2015/UQM-Technologies-Receives-New-Orders-for-Proterras-Catalyst-Bus-Program-for-Calendar-Year-2016-Delivery/default.aspx |title=UQM Technologies receives new orders for Proterra's Catalyst bus program for calendar
The DuoPower drivetrain was introduced in October 2017; it uses two electric traction motors and has a claimed 20% increase in efficiency compared to the original single-motor drivetrain, which was redesignated ProDrive.<ref>{{cite news |url=http://www.greencarcongress.com/2017/10/20171009-proterra.html |title=Proterra introduces two-motor DuoPower drivetrain for its Catalyst electric buses; partnership with Van Hool |date=9 October 2017 |work=Green Car Congress |accessdate=12 July 2018}}</ref> As ProDrive, the Catalyst was equipped with an upgraded UQM HD250 motor,<ref name=Altoona-PD/> which offered increased ratings of {{convert|250|kW|hp|abbr=on}} peak power ({{convert|150|kW|hp|abbr=on}} continuous) and {{convert|900|Nm|ftlb|abbr=on}} peak torque ({{convert|360|Nm|ftlb|abbr=on}} continuous).<ref name=UQM-motors/> The DuoPower traction motors are permanent magnet alternating current motors<ref>{{cite press release |url=https://www.parker.com/portal/site/PARKER/menuitem.31c35c58f54e63cb97b11b10237ad1ca/?vgnextoid=c05969dafb00a610VgnVCM100000e6651dacRCRD |title=Parker Hannifin to showcase its latest mobile system solutions at bauma 2019 |date=April 8, 2019 |publisher=Parker Hannifin |accessdate=9 November 2020}}</ref> manufactured by [[Parker Hannifin]] as part of their Global Vehicle Motor (GVM) series.<ref name=Altoona-DP/><ref>{{cite web |url=https://promo.parker.com/parkerimages/Parker.com/Literature/Electromechanical%20North%20America/CATALOGS-BROCHURES/GVM%20Catalog.pdf |title=Electric and Hybrid Vehicle Accessory, Power Generation & Traction Motor Solutions |date=2014 |publisher=Parker Hannifin |accessdate=9 November 2020}}</ref>
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The TerraVolt XR [[Lithium nickel manganese cobalt oxides|lithium nickel manganese cobalt oxide]] batteries<ref name="Catalyst-intro" /> were introduced in 2015 with improved range but slower charging, approximately one hour to full charge.<ref name="FC-XR-gcc">{{cite news |url=http://www.greencarcongress.com/2015/02/20150224-proterra.html |title=Proterra introduces new extended range battery pack for electric transit buses; up to 180 miles |date=February 24, 2015 |work=Green Car Congress |accessdate=July 12, 2018}}</ref>
TerraVolt E2 batteries were introduced in 2016 with the longest range and slowest charging.<ref name="E2-battery" /> The E2 battery range features a 3–5 hour charge time.<ref name=E2-battery/><ref>{{cite
Batteries are carried under the Catalyst chassis, and use an interchangeable mounting system, so each Catalyst can hold between four and ten battery packs. The batteries can be swapped out, upgraded, or reconfigured as needs change.<ref name=Catalyst-intro />
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