The Mastervolt ChargeMaster 12/25-3 is a battery charger with 25 A at 13.25 V of charging current, a weight of 1.8 kg 4.0 lb, a supply of 120/230 V (90-265 V), 50/60 Hz and an ingress rating of IP23.
Last updated: 8 October 2026
Battery and charging
- What it draws on standby
- < 2 mA
- Temperature compensation
- yes
- Input voltage
- 120/230 V (90-265 V), 50/60 Hz
- Output current
- 25 A at 13.25 V
- Charging voltage
- 14.25 V
- Float voltage
- 13.8 V
“Power consumption (DC side) < 2 mA”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
“Temperature compensation yes”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
“Nominal input voltage 120/230 V (90-265 V), 50/60 Hz”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
“Total charge current 25 A at 13.25 V”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
“Charge voltage Absorption 14.25 V”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
“Charge voltage Float (Gel/AGM batteries) 13.8 V”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
Battery care and safety
- Operating temperature range
- -25 °C to 60 °C, derating < 0 °C and > 40
- Ingress protection
- IP23
“Temperature range (ambient temp.) -25 °C to 60 °C, derating < 0 °C and > 40”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
“Protection degree IP23”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
Size and fit
- Overall dimensions
- 234 x 132 x 60 mm 9.2 x 5.2 x 2.4 inch
- Stated weight
- 1.8 kg 4.0 lb
“Dimensions, hxwxd 234 x 132 x 60 mm 9.2 x 5.2 x 2.4 inch”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
“Weight 1.8 kg 4.0 lb”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
Other findings
- Battery bank size
- 50-250 Ah
- Charge characteristic
- IUoUo, automatic 3-step+ for Gel/AGM/wet/Lithium Ion
- Nominal output voltage
- 12 V
- Number of battery outputs
- 3
“Battery bank size 50-250 Ah”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
“Charge characteristic IUoUo, automatic 3-step+ for Gel/AGM/wet/Lithium Ion”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
“Nominal output voltage 12 V”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
“Number of battery outlets 3”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
Certification claims
- Product compliance claim
- CE, ABYC A-31, SAE J1171/ISO 8846 ignition protected, RRR, RMRS
“Compliance CE, ABYC A-31, SAE J1171/ISO 8846 ignition protected, RRR, RMRS”
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
Sources
- Archived document
Source: mastervolt.com/products/chargemaster-12v/chargemaster-12-25-3
Retrieved October 8, 2026