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Stop a dead battery before it happens
A BatteryProtect sits between your battery and your loads and disconnects them before deep discharge does lasting damage — or leaves you without the power to start your engine. Set the voltage, and it handles the rest.
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| Device | Type | How it works | Best for | From |
|---|---|---|---|---|
| BatteryProtect | Low-voltage disconnect | Disconnects loads at your chosen voltage and reconnects automatically once the battery recovers | Set-and-forget protection at the lowest cost | $36.55 USD |
| Smart BatteryProtect | Low-voltage disconnect + Bluetooth | Same protection, programmed and monitored from your phone in VictronConnect | Easy setup, plus settings you can change anytime | $44.95 USD |
| Battery Balancer | Series-bank balancer | Keeps two series-connected 12V batteries at an equal state of charge, with a drift alarm | 24V and 48V banks built from 12V batteries | $48.45 USD |
Good to know: a BatteryProtect passes current in one direction only — battery to loads — so chargers connect straight to the battery rather than through it. Keep an eye on your bank with a battery monitor, and if you're managing two banks from one charge source, see our isolators & combiners.
How to choose, in three questions
Standard or Smart, which amp rating, and where the Battery Balancer fits in.
Standard or Smart?
Both protect your bank the same way. The standard BatteryProtect is programmed with the button and display on the unit itself, while the Smart version adds Bluetooth so you can set disconnect levels and check status from your phone in VictronConnect. Many of our customers find the Smart version worth it for the easier setup alone.
Which amp rating?
Add up the loads that will run through it and choose the next size up — 65A, 100A or 220A. The 12/24V models detect your system voltage automatically, and a dedicated 48V 100A version covers higher-voltage banks. Standby draw is just 0.6mA, so it won't run down the bank it's protecting.
Do I need a Battery Balancer?
If your 24V or 48V bank is built from 12V batteries in series, small differences between batteries grow over time — one drifts high, another runs low, and the whole bank ages early. One balancer keeps a 24V pair equal; a 48V string of four uses three. An alarm output flags a battery that's drifting so you catch problems early.
Why buy from Blue Marine
True Blue Victron distributor
Warranty and setup support handled by us, not a ticket queue.
ABYC-certified advisors
We help you size the right disconnect for your loads, chemistry and system voltage.
Free US shipping over $49
Fast shipping from Seattle and 60-day returns on non-lithium items.
Real people, real boats
Call (800) 628-6306 Mon–Sat.
Protecting a bank you'd rather not replace?
Tell us your system voltage, your battery chemistry, and the loads you're running — we'll point you to the right BatteryProtect size, and tell you honestly whether a balancer belongs in your setup.
BatteryProtect & balancer FAQ
What does a BatteryProtect actually do?
It's a low-voltage disconnect. Set a threshold, and when your battery sags to that voltage the BatteryProtect disconnects your loads before deep discharge does lasting damage — or before you lose the power to start your engine. Once the battery recovers, it reconnects automatically.
What's the difference between the standard and Smart BatteryProtect?
The protection is identical. The Smart version adds Bluetooth, so you program disconnect levels and check status in the VictronConnect app on your phone; the standard version is programmed with the button and display on the unit itself. Both come in 65A, 100A and 220A 12/24V models plus a 48V 100A version.
Can I charge the battery through a BatteryProtect?
No — it handles current in one direction only, from battery to loads, so chargers and other charge sources connect directly to the battery instead of through it. The upside of that simple one-way design: it draws just 0.6mA in standby.
Does BatteryProtect work with lithium batteries?
Yes — it includes a Li-ion mode designed to be switched by a compatible BMS through its remote on/off terminal, so the BMS can shed loads to protect the cells. Lithium setups vary, so tell us which battery and BMS you're running and we'll confirm the right configuration.
What does the Battery Balancer do, and how many do I need?
It equalizes the state of charge of two series-connected 12V batteries, so one battery doesn't drift high while its partner runs low — a common cause of early bank failure. A 24V bank needs one balancer, and a 48V string of four 12V batteries needs three. If the midpoint drifts too far, the alarm triggers so you catch a weak battery early.