MillerTech 1240-BT
The MillerTech 1240-BT is a battery pack with a nominal voltage of 12.8V, a peak of 120 A and an ingress rating of IP65.
Last updated: 15 October 2026
Battery and charging
- Voltage
- 12.8V
- Cell arrangement
- 4S-4P
- Maximum continuous discharge
- Max Charge/Discharge Current: 40A
- Peak discharge
- 120A
- Highest charge current it will take
- Max Charge/Discharge Current: 40A
- Charging voltage
- Max Charge/Voltage: 14.6V
“Capacity 40AH Voltage 12.8V Weight 14 lbs Size 7.6” x 5.2” x 7.25””
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
“Built with heavy-duty M8 stainless steel terminals and a robust 4S-4P configuration”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
“Max Charge/Discharge Current: 40A”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
“Peak Discharge: 120A – 5 sec”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
“Max Charge/Discharge Current: 40A”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
“Max Charge/Voltage: 14.6V”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
Battery care and safety
- Operating temperature range
- -4°F to 140°F
- Ingress protection
- IP65
- Low-temperature charge protection
- Yes
- What the battery management system protects against
- protects against over-charging, over-discharging, excessive current, and unsafe temperatures
“The battery is designed to operate in temperatures ranging from -4°F to 140°F”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
“This means they are Marine approved IP65 rated”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
“Low Temp Charging Protection: Yes”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
“The battery includes an integrated Battery Management System (BMS). The BMS protects against over-charging, over-discharging, excessive current, and unsafe temperatures to extend battery life.”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
Size and fit
- Overall dimensions
- 7.6” x 5.2” x 7.25”
- Terminals
- heavy-duty M8 stainless steel terminals
- Connector on the battery
- M8
“Capacity 40AH Voltage 12.8V Weight 14 lbs Size 7.6” x 5.2” x 7.25””
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
“Built with heavy-duty M8 stainless steel terminals and a robust 4S-4P configuration for powerful performance without excessive heat.”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
“Built with heavy-duty M8 stainless steel terminals and a robust 4S-4P configuration”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
Other findings
- Bluetooth
- Bluetooth
“Equipped with Bluetooth technology”
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
Sources
- 12V 40AH Sport Series Lithium Battery W/ Bluetooth (1240-BT) - MillertechArchived document
Source: millertechenergy.com/product/12v40ah-sport-series-lithium-battery-with-bluetooth
Retrieved October 11, 2026