Shop this guide: Victron Blue Smart IP65 Charger (120V) · Blue Smart IP22 Charger (1 or 3 outputs)
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A maintenance charger keeps your RV's batteries healthy through storage season and brings them back to full after a trip. The two names that dominate this category are Victron's Blue Smart series and NOCO's Genius line. Both are good products — here's how to choose.
What matters in a shore-power battery charger
- Charge current vs bank size — as a rule of thumb, use roughly 10–20% of battery capacity in amps: a 10A charger suits up to ~100Ah; a 100Ah+ lithium bank recovers much faster at 15–25A.
- Chemistry profiles — LiFePO4 lithium wants a different charge curve than AGM or flooded; the charger must support your battery natively.
- Visibility and control — can you see charge state and change settings, or is it a black box with an LED?
- Environment — chargers mounted in battery bays or outdoor compartments should be sealed against dust and moisture.
Victron Blue Smart IP65: app-controlled and waterproof
The Blue Smart IP65 line (from small 6V/12V maintainers up to 12V/25A and 24V units) is a sealed, IP65-rated waterproof charger with Bluetooth built in. The VictronConnect app is the difference-maker: you see real-time volts and amps, pick lithium/AGM/gel profiles, set a low-current mode for small batteries, and reconfigure any setting from your phone. Adaptive six-stage charging brings the battery to full and then holds it in storage mode indefinitely, and Victron backs it with a five-year warranty. If you run a bigger bank or want three isolated outputs (start battery + house bank + more) from one wall unit, the fan-cooled Blue Smart IP22 covers that.
NOCO Genius 10: the recovery specialist
The NOCO Genius 10 is a 10A, 6V/12V charger that supports lithium, AGM, gel and flooded batteries, with an integrated thermal sensor that adapts charging to ambient temperature. Its party trick is deep recovery: it can start charging a battery pulled down to 1V, and a Force Mode will even engage a battery at 0V — genuinely useful if you routinely rescue dead batteries. It carries a 3-year warranty. Where it gives ground to the Victron: there's no app or Bluetooth, so no live data and no fine-grained profile control, and 10A is its ceiling — there's no higher-current option in the same form factor for big lithium banks. If your main use is reviving and maintaining vehicle batteries and you don't care about app control, the NOCO is a fair buy.
Bottom line
- RV house banks, lithium, or anything you want visibility into: Blue Smart IP65 — the app, the sealed housing and the five-year warranty win.
- Multiple batteries from one charger: Blue Smart IP22 3-output.
- Rescuing stone-dead vehicle batteries: NOCO Genius 10's 0V Force Mode is the honest pick.
FAQ
Which size Blue Smart IP65 do I need?
Match roughly 10–20% of battery amp-hours: 12/5 or 12/7 for batteries up to ~70Ah, 12/10 or 12/15 for ~100–150Ah, and 12/25 for large lithium banks.
Can these charge LiFePO4 lithium?
Yes — both brands support LiFePO4. On the Victron you select (or customize) the lithium profile in the app; on the NOCO you select the lithium mode button.
Can I leave the charger connected all winter?
Yes. Both hold a storage/maintenance float. The Victron's storage mode plus app monitoring makes it easy to confirm the battery is actually healthy come spring.