Lester Electrical TT-650W, 48V / 13.5A
SKU 33000
Lester Electricallesterelectrical.com/products/tt-650
Last updated: 24 September 2026
Battery and charging
- Battery types it will charge
- Sources disagree
Lead-acid wet, AGM, TPPL and gel; lithium; and custom
“Battery types Lead-acid (Wet / AGM / TPPL / Gel), lithium (LifePO4 / NMC / others), & custom”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
Wet/flooded, AGM and gel
“This charger is compatible with battery profiles for different battery types (including wet/flooded, AGM, and gel) and capacities of batteries.”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
- CAN bus communication
- CANopen, SAE J1939 and CAN 2.0
- Output current
- 13 A maximum — not the 13.5 A the model is sold as
- Mains input it accepts
- 100-240 Vac rated, 90-265 Vac operating
- Output power
- 650 W
- Maximum output voltage
- 72 Vdc, at 48 Vdc nominal
- Maximum current it draws from the wall
- Under 8 A from the wall
- Lowest pack voltage it will start into
- It will start into a pack as low as 10 Vdc
- Waking a sleeping BMS
- A two-wire line that wakes a sleeping BMS when AC arrives
- The pack's BMS can stop the charge
- Yes, and it has a fault code of its own for it
- The charge profile is set per order, not per model
- At the factory, to the original order
- How a lithium pack shows a finished charge
- On some lithium packs it never shows green, even when charging is done
- What restarts a charge, off-board and on-board
- Off-board needs the DC unplugged to restart; on-board does not
“CAN bus CANopen, SAE J1939, CAN 2.0”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
Disputed
“Current, maximum 13 A”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“Voltage range, rated 100-240 Vac Voltage range, operating 90-265 Vac”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“Power 650 W”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“Voltage, nominal 48 Vdc Voltage, maximum 72 Vdc”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“Current, maximum <8A”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“Voltage, min start-up 10 Vdc”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“Wake-up signal Two wire interface allows battery management system to wake-up when AC power is present”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“Red Blue Yellow Blue Purple CRITICAL EXTERNAL – Battery BMS requesting charge termination.”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
“The charger was factory-configured with the active battery profile that was requested as part of the original order from Lester Electrical.”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
“Note: Some Lithium-Ion batteries disconnect the charger from the batteries when the batteries reach full charge. In these situations, the charger LED will NOT be illuminated green despite the fact that the charge cycle has completed. Please refer to the State of Charge (SOC) display on the batteries to confirm a full charge.”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
“Disconnecting and reconnecting AC power while the DC output remains connected to a battery pack WILL NOT automatically start a new charge cycle. Disconnecting the DC output from the battery pack IS REQUIRED to automatically start a new charge cycle.”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
Battery care and safety
- Storage temperature
- -40 °C to 85 °C
- Operating temperature range
- -25 °C to 50 °C — but the Fahrenheit low printed beside it is wrong
- What the maker warns a mismatched pack will do
- A pack mismatched to the charger's profile may burst
- What it does in storage mode
- Float or periodic, depending on which battery profile is loaded
- The extension lead it permits
- 3-conductor, 14 AWG minimum, 25 ft maximum
“Storage temperature -40 °C to 85 °C (-40 °F to 185 °F)”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
Unconfirmed
“Operating temperature -25 °C to 50 °C (-30 °F to 122 °F)”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“CAUTION: THIS CHARGER IS FOR USE ONLY WITH BATTERY SYSTEMS OF THE SAME TYPE AS THE ACTIVE BATTERY PROFILE. BATTERIES IMPROPERLY MATCHED WITH THE CHARGER MAY BURST CAUSING PERSONAL INJURY AND DAMAGE TO THE BATTERIES OR CHARGER.”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
“Depending on the battery type and battery profile selected, a storage charge can be a continuous float or a periodic charge mode.”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
“If an extension cord is necessary, it must be a 3-conductor, 14 AWG (2.0 mm2) minimum, heavy-duty cord with ground. It must also be in good electrical condition and as short as possible, 25 ft (7.6 m) maximum.”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
Size and fit
- Overall dimensions
- 305 x 104 x 136 mm, brackets and handle not included
- Weight as stated
- 10 lb (4.54 kg)
- DC output connector
- 8-pin Deutsch — no cart-specific plug of its own
- AC input connector
- An IEC 60320 C14 inlet — an ordinary kettle lead, with a clamp
- Mounting brackets it takes
- It takes the Summit II 650W and 1050W brackets
- Smallest DC cable it permits
- 13 AWG minimum equivalent, or two 16 AWG in parallel
- What the eight output pins carry
- 8 pins: two +BAT, two −BAT, two CAN, two Wake
“Dimensions (LxWxH), 305 x 104 x 136 mm”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“Weight 10 lbs. (4.54 Kgs)”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“DC output connector 8-pin Deutsch”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“AC input connector IEC 60320 C14 inlet with cord clamp”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“Summit II 650W (Shelf & On-board) Summit II 1050W (Shelf & On-board)”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“WARNING: CHARGER DC CORDSET MUST HAVE A MINIMUM EQUIVALENT OF 13 AWG WIRE SIZE (TWO 16 AWG WIRE IN PARALLEL) FOR PROPER HEAT DISSIPATION. TO PREVENT RISK OF FIRE, DO NOT USE SMALLER GAUGE WIRE.”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
“The DC output is located on the 8-pin connector on the charger. Two pins are used for +BAT and two pins for –BAT connections. This connector also has two CAN communication and two Wake signals for vehicle interface”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
Compatibility
- What its maker says it is for
- Golf carts, PTVs and industrial vehicles
- Cordset part numbers, by cart plug
- Lester publish a cordset part number per cart plug — E-Z-GO, Club Car and Yamaha
“•Powerful Performance – Launching with a 650W 48V/13.5A option designed to power a broad range of applications, including golf carts, personal transportation vehicles (PTVs), and industrial vehicles.”
Source: web.archive.org/web/20260515171230/https://www.lesterelectrical.com/tt-650w-charger-launch
“9ft, DC Cordset with 48V E-Z-GO Powerwise Plug 44384S 9ft, DC Cordset with 48V E-Z-GO Gray Molded Plug 44412S 9ft, DC Cordset with 48V CCI Gray Molded Plug 44387S 9ft, DC Cordset with 48V Yamaha 2-pin Plug 44386S 9ft, DC Cordset with 48V Yamaha 3-pin Plug 44421S”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
“9ft, DC Cordset with 48V E-Z-GO Powerwise Plug 44384S”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
Frame and components
- Enclosure rating
- IP66 and NEMA 4
- Cooling
- Fanless, natural convection
- What its USB port is for
- A USB-A host port for software and profile updates, history and logging
- Locking the cart out while it charges
- A normally-closed relay that opens on AC, locking the cart while charging
“Enclosure rating IP66, NEMA 4”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“Cooling Natural convection (no fan)”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“USB Port for software and profile updates, history records and data logging”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“The lockout control signal is a normally closed relay contact which opens when AC power is connected.”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
Identity
- The models and part numbers it covers
- One model only — 48V / 13.5A, part 33000
- When the maker announced it
- Announced 15 August 2025, for samples and pre-orders
“AVAILABLE MODELS 48V / 13.5A 33000”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“August 15, 2025 – Lincoln, Nebraska – Lester Electrical, a global leader in battery charging solutions, proudly unveils its latest product, the TT-650W charger.”
Source: web.archive.org/web/20260515171230/https://www.lesterelectrical.com/tt-650w-charger-launch
Certification claims
- Safety and emissions claims
- FCC Part 15 and ICES-003 Class A; "Designed to" UL 1564 and CSA 107.2-01
- Efficiency programmes it is listed under
- DOE and CEC listed; NRCan marked pending
“Safety / Emissions FCC Part 15 & ICES-003, Class A / Designed to UL 1564 & CAN/CSA-C22.2 NO. 107.2-01”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
“Efficiency U.S. Department of Energy (DOE); California Energy Commission (CEC); Natural Resources Canada (NRCan) (pending)”
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
Compatible batteries
No sourced battery-compatibility evidence is on file for this charger yet.
Sources
- Lester Electrical — TT 650W ManualMANUFACTURER DOCUMENT
Lester Electrical
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Manual.pdf
Verified September 23, 2026
- Lester Electrical — TT 650W Data SheetMANUFACTURER DOCUMENT
Lester Electrical
Source: lesterelectrical.com/wp-content/uploads/2026/08/TT-650W-Data-Sheet.pdf
Verified September 23, 2026
- Lester Electrical — TT-650W charger launch (Internet Archive capture, 15 May 2026, page since deleted)MANUFACTURER GENERAL PAGE
Lester Electrical
Source: web.archive.org/web/20260515171230/https://www.lesterelectrical.com/tt-650w-charger-launch
Verified September 24, 2026