Power & Charging Tech3 min read
What is a B2B (DC-DC) Split Charging?
Properly charges a leisure battery from the alternator, even with a modern 'smart' alternator that older systems struggle with.
Simplified animation — not to scale.
The full picture
Newer vehicles use smart alternators that vary their output to save fuel, which confuses older split-charge relays into barely charging the leisure battery at all. A DC-DC (B2B) charger manages the process itself, guaranteeing a proper, complete charge regardless of what the alternator is doing.
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