MillerTech 12135-DP
The MillerTech 12135-DP is a battery pack with a nominal voltage of 12.8V, LFP cells, a peak of 300 A and an ingress rating of IP65.
Last updated: 15 October 2026
Battery and charging
- Voltage
- 12.8V
- Chemistry
- LFP
- Peak discharge
- 300A
- Cold cranking amps
- Cold Cranking Amps (CCA) 1500A
- Charging voltage
- Max Charge/Voltage: 14.6V
“Capacity 135AH Voltage 12.8V Weight 33 lbs Size 13” x 6.75” x 9””
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
“Chemistry: LFP Efficiency: 98%”
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
“Peak Discharge – 300A The battery can deliver up to 300 amps for short bursts (up to 5 sec.)”
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
“Cold Cranking Amps (CCA) 1500A”
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
“Max Charge/Voltage: 14.6V”
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
Battery care and safety
- 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
- Temperatures it may be charged in
- Charge Temp. Range: 25°F -131°F
“This means they are Marine approved IP65 rated”
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
“Low Temp Charging Protection: Yes”
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-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/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
“Charge Temp. Range: 25°F -131°F”
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
Size and fit
- Overall dimensions
- 13” x 6.75” x 9”
- Terminals
- heavy-duty M8 bolts/washers in 18-8 stainless steel
- Connector on the battery
- M8
“Capacity 135AH Voltage 12.8V Weight 33 lbs Size 13” x 6.75” x 9””
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
“Built with heavy-duty M8 bolts/washers in 18-8 stainless steel.”
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
“Built with heavy-duty M8 bolts/washers in 18-8 stainless steel”
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
Other findings
- Bluetooth
- Bluetooth
“Equipped with Bluetooth technology”
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
Sources
- 12V 135AH Dual Purpose Starting Battery W/ BT (12135-DP) - MillertechArchived document
Source: millertechenergy.com/product/12v-135ah-sport-series-lithium-iron-phosphate-with-bluetooth
Retrieved October 11, 2026