Power multiple battery banks with confidence using the Mastervolt Battery Mate 2503IG Battery Isolator. Engineered for marine and automotive systems, this intelligent electronic isolator keeps two or three batteries charging to their full potential without the annoying voltage drop of traditional diode splitters.
Designed to work with any alternator or battery charger, the Battery Mate uses MOSFET technology to actively compensate voltage loss, ensuring fast, complete charging across all connected batteries—even when their brands or charge voltages differ. Its negligible voltage drop means you won’t have to tweak your alternator settings or accept slower charging on one bank to feed another.
Key Benefits
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Electronic MOSFET technology minimizes voltage drop and maintains correct charging voltage for all battery banks.
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Three battery outlets support two or three independently charged batteries for 12V or 24V systems.
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Compatibility works with any alternator or charger, ideal for mixed-brand setups.
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High efficiency charges quickly with reduced heat and no need for constant adjustments.
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Robust construction completely corrosion-proof with aluminium heat sinks and synthetic end plates.
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Easy installation with connection lugs, solid bolt connections, nuts, and locking rings.
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Clear status LED display shows when power input is active for quick diagnostics.
Why It Fits Your System
In onboard systems that rely on two or more batteries, the Battery Mate ensures each battery bank is charged efficiently and independently. It excels when you have different alternators or chargers and even when the exact charge voltage cannot be adjusted. This makes it ideal for boats and other vehicles where reliability and speed of charging across multiple batteries matter most.
Specifications
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Number of battery outlets: 3
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Dimensions (H x W x D): 8.1 x 5.5 x 3.1 inches
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Weight: 2.2 lb
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Max output (battery charger): 200 A
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Max output (alternator): 250 A
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Model: 83125035
The Mastervolt Battery Mate 2503IG is the trusted choice when you need reliable, high-yield charging for multiple batteries with minimal fuss. Built to endure harsh conditions and deliver consistent performance, it’s the smart upgrade for demanding 12V and 24V systems.
| Number of battery outlets |
3 |
| Dimensions, hxwxd |
8.1 x 5.5 x 3.1 inch |
| Weight |
2.2 lb |
| Max. output battery charger |
200 a |
| Max. output alternator |
250 a |
