I have three 12V Cranking batteries and one 12V deep cycle can these all be charged by one on board 4 bank charger?

Yes I charge three different banks with a 3 bank

Can this charger charge AGM batteries?

Yes. According to the manual it charges: Flooded, AGM, Gel, MLI, Flooded traction

Is there a setting for AGM batteries or does the unit automatically adjust?

There is an AGM setting. I’m using my charger on a set of AGMs and it’s been an excellent unit. I also put in the remote control head so I don’t have to stick my head back under the deck to check status. The remote head is also excellent. You can control and monitor with it. Overall very happy with this charger and it’s been keeping my AGMs in top shape.

is this charger waterproof?

I would not submerge it, or expose it to direct spray.I usually install a shield on top to protect it from dripping water from above.

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Chargemaster 12/25-3

Product ID: 296022866

Details

Brand
MASTERVOLT
Colour
Turquoise
Item Weight
1.81 kg
Output Voltage
12 Volts
Product Dimensions
6.1D x 13.2W x

⚡25A high-efficiency charging

📡Remote monitoring ready

🔋3-bank multi-battery support

Description

⚡ Charge smarter, sail farther — Mastervolt’s power at your fingertips!

MARINE GRADE DURABILITY - Built tough for harsh marine and off-grid environments, ensuring reliable performance season after season.
TRIPLE BANK VERSATILITY - Simultaneously manage and optimize three separate battery banks for ultimate control.
PLUG AND PLAY INSTALLATION - Compact, lightweight design with straightforward setup—get powered up without hassle.
POWER PACKED 25 AMP OUTPUT - Rapidly revitalize your batteries with industry-leading 25A charging power.
SEAMLESS REMOTE MONITORING - Stay effortlessly connected with a sleek remote display to track charge status from anywhere onboard.

The Mastervolt ChargeMaster 12/25-3 is a premium 3-bank 12V battery charger delivering 25 amps of efficient power, designed specifically for boats, RVs, and off-grid systems. With remote monitoring capability and robust marine-grade construction, it ensures your batteries stay optimally charged and ready, backed by a strong reputation and high user ratings.

Specifications

ASIN	B007D27KW4
Amperage	25 Amps
Box Contents	Great Product
Brand Name	MASTERVOLT
Colour	Turquoise
Compatible Devices	Batteries (including Lithium Ion)
Country of Origin	USA
Current Rating	25 Amps
Customer Reviews	4.4 4.4 out of 5 stars (35)
External Testing Certification	Não Aplicável
Global Trade Identification Number	00852968002318
Input Voltage	240 Volts
Item Dimensions D x W x H	6.1D x 13.2W x 23.4H Centimeters
Item Type Name	Great Product
Item Weight Unit of Measure	1.81 kg
Manufacturer	MasterVolt
Manufacturer Part Number	44010250
Model Number	44010250
Number of Items	1
Number of Packs	3
Number of Ports	3
Output Voltage	12 Volts
UPC	852968002318
Unit Count	1.0 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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