Xcelsior CHARGE NG is New Flyer's next generation battery-electric, zero-emission bus. When accelerating from a constant speed, the bus emitted an average maximum noise level of 66.1 dB(A), considerably lower than the average maximum noise level of 70.4В dB(A) measured from a conventionally-powered XD40.

It was equipped with 4 XALT Xsyst 7 (7В kWh) batteries and a SPHEROS fuel-fired heater. ДЄt Altoona, the as-tested empty weight of an XE40 was measured at 32,770В lb (14,860В kg) with a capacity of 76 (38 seated passengers + 37 standing passengers + 1 driver) for a total GVW of 43,550В lb (19,750В kg). Shop or depot charging may be performed using SAE J3068 and J1772 connectors supplying up to 150В kW. On-route rapid charging is provided through an overhead pantograph designed to be interoperable with the SAE J3105 standard supplying 300вЂ“450В kW. Batteries are supplied by XALT Energy or A123 Systems (XE60 long-range models and XHE nn fuel cell models). The Xcelsior CHARGE variant (XE nn) uses the Siemens ELFA2 electric drive system with different options for battery capacity, depending on the charging speed and range required. In October 2017, the Xcelsior CHARGE sub-line was introduced. The original battery-electric Xcelsior bus, offered as an XE40, used a permanent magnet traction motor built by Siemens. The first battery-electric Xcelsior buses were a powertrain option within the regular Xcelsior line development was announced in 2011, a prototype was shown in 2012, and regular production began in 2014. The Toronto Transit Commission operates 25 XE40 buses. Massachusetts Bay Transportation Authority was the lead agency for the XE60, ordered in January 2019 and placed into service on July 31, 2019. The first Xcelsior battery electric buses (XE40) were built in 2014 and delivered to the Chicago Transit Authority and Winnipeg Transit. Xcelsior CHARGE ДЄn XE40 battery-electric bus operated by TriMet in Portland, Oregon, connected to a SAE J3105 (OppCharge) overhead recharging station (2019) King County Metro also purchased the XT60 (articulated trolleybus), and both XT40s and XT60s were subsequently purchased by the San Francisco Municipal Railway, for the San Francisco trolleybus system. The first trolleybus version of the Xcelsior was an XT40 built in 2014 for the Seattle trolleybus system, operated by King County Metro, the first unit of an order placed in 2013. Brampton Transit, serving Brampton, Ontario, was the first agency to order the Xcelsior. ДЄt launch, the Xcelsior was only available in a 40-foot (12В m) length with power from the Cummins ISL 280 and a Allison B400 conventional transmission or the Allison EP-40 hybrid drive.

The bus also had a redesigned front face, bumpers, and roof shrouds that also offered better aerodynamics and the front improved visibility for the driver. The utilitarian instrument panel was replaced with an automotive-style electronic dashboard. To improve interior aesthetics, visible fasteners were eliminated and molded plastic surfaces were introduced.

To improve accessibility, the floor height was lowered to 14 inches (360В mm) with the ability to kneel down to 10 inches (250В mm), and the front entry door was widened, allowing a wider wheelchair ramp. By moving the fuel tank and modifying the rear suspension, seating capacity was increased from 39 to 42 (on the 40' model), with more forward-facing seats. The interior of the bus was also modified. New Flyer found that the move improved the weight balance of the bus, and when combined with enhanced insulation, contributed to the vehicle running quieter.

To accommodate the change, the Thermo King air conditioning system was moved from the rear of the bus to a roof mount location over the front axle. The bus was also designed to allow a much larger cooling system and the addition of a SCR system, both required to meet the more stringent EPA mandates that were coming in 2010. Compared to the Low Flyer, the Xcelsior was 10% lighter, boosting fuel economy by about 7%. The Xcelsior started off as a set of improvements to the company's prior product, the New Flyer Low Floor, but over the development process the company said it ended up designing a new bus. The Xcelsior was introduced October 2008 APTA Expo held in San Diego. For example, a New Flyer XE40 NG is a 40' (nominal) rigid Next Generation Xcelsior with battery-electric power, or an XN60 is a 60' articulated Original Generation Xcelsior with CNG power.

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