If you landed here searching BAT412201084, you are holding a quote, a packing slip, or a distributor catalog line and you want to know exactly what that string of characters buys you. Here is the short answer: BAT412201084 is the Victron Energy manufacturer part number for the Victron 12V/220Ah AGM Deep Cycle Battery — a Group 8D sealed VRLA battery that weighs about 66 kg and stores 2.64 kWh of energy. We stock and quote this line for off-grid cabins, marine house banks, and small commercial backup builds, and we have muscled more of these 8D cases onto battery racks than we care to count.
The long answer — what the code structure means, what the battery actually does well, where it fails, how to verify you are buying the genuine article, and how to size a bank around it — is the rest of this guide.
What BAT412201084 actually is
Victron Energy assigns every SKU a structured part number, and the battery lines follow a predictable pattern. The BAT prefix flags the energy-storage catalog family. The next digits encode the battery chemistry family, the nominal voltage, and the amp-hour class, and the trailing characters pin the exact variant and terminal hardware. Decode BAT412201084 against Victron's published catalog and you land on one product with no ambiguity:
| Attribute | Value | Field note |
|---|---|---|
| Manufacturer | Victron Energy (Netherlands) | Authorized-channel product; verify your seller is a Victron distributor |
| Part number | BAT412201084 | Printed on the case label, the datasheet, and every legitimate invoice |
| Product name | 12V/220Ah AGM Deep Cycle Battery | Group 8D footprint |
| Chemistry | VRLA AGM (valve-regulated lead-acid, absorbed glass mat) | Sealed, maintenance-free, no watering |
| Nominal voltage | 12 V | Series strings required for 24V/48V systems |
| Rated capacity | 220 Ah at the 20-hour rate (C20), 25 °C | Capacity drops at faster discharge rates — see the rate table below |
| Stored energy | ≈ 2.64 kWh (12 V × 220 Ah) | Usable energy is lower once you respect depth-of-discharge limits |
| Terminal | M8 threaded insert | Torque hardware per datasheet; do not guess |
| Dimensions (L × W × H) | 522 × 238 × 240 mm (≈ 20.6 × 9.4 × 9.4 in) | Check battery-box and rack clearances before ordering |
| Weight | ≈ 65.6 kg (≈ 145 lb) | Two-person lift. We mean it — we have seen the back injuries |
| Design life | 7–10 years (float service) | Cyclic life depends on depth of discharge — table below |
| Warranty (lead-acid) | 2 years from purchase, per Victron policy | Keep the invoice; claims run through the seller |
One caution from the field: we have had customers order "the 220 amp Victron" and receive the Gel variant (BAT4122xx104 series) because a reseller's listing mashed the two families together. AGM and Gel charge at different voltages. Check the full part number on the case label when the truck shows up, not after the bank is wired.
Why contractors keep specifying this battery
The Victron AGM range has very low internal resistance for a lead-acid product, and that single property explains most of its loyal following. Low internal resistance means the battery tolerates high discharge current without the voltage sag that collapses cheaper deep-cycle batteries under inverter load. Victron's own literature positions the AGM line for high-current service — inverters, bow thrusters, winches, engine starting — and that matches what we see on installs.
Three jobs where BAT412201084 earns its freight bill:
- Marine house banks. Four units in series/parallel give you a 24V, 440Ah bank that runs a 3kW inverter hard without tripping low-voltage alarms. Sealed construction means no electrolyte sloshing in a seaway, and ABS-rated installations are routine.
- Off-grid and backup banks where lithium is off the table. Unheated outbuildings that sit below freezing for months, sites with no budget for a heated battery room, and customers who simply want a chemistry the local inspector already understands.
- High-surge loads on modest banks. Well pumps, air compressors, and refrigeration compressors that demand 3–5× running current at startup. The low internal resistance absorbs the inrush that makes lesser AGM blocks stumble.
Field note: I've pulled a 1HP submersible well pump off a 4× BAT412201084 bank through a 24V inverter for three seasons on a farm install. The pump starts clean every time. The tradeoff is the owner lifts 590 lb of lead every 5–7 years instead of 200 lb of lithium every 15 — and he knows it, and he chose it anyway because the pumphouse sits at −20 °F in January.
Cycle life: the number that actually decides your cost per kWh
Lead-acid pricing looks cheap until you divide by cycles. Victron publishes cycle-life-versus-depth-of-discharge data for this range, and the curve is steep. Treat these figures as the honest ceiling for planning:
| Depth of discharge (DoD) | Approx. cycle life | Usable energy per cycle | Lifetime throughput per battery |
|---|---|---|---|
| 80% | ≈ 400 cycles | 176 Ah (≈ 2.11 kWh) | ≈ 845 kWh |
| 50% | ≈ 600 cycles | 110 Ah (≈ 1.32 kWh) | ≈ 792 kWh |
| 30% | ≈ 1,500 cycles | 66 Ah (≈ 0.79 kWh) | ≈ 1,188 kWh |
Read that table twice, because it contains the whole economics of AGM. Discharging to 80% every day kills the bank in barely over a year. Cycling at 30% DoD more than triples the service life but forces you to buy three times the nameplate capacity for the same daily energy. Our standard design rule for this product line: size the bank so an average day lands between 30% and 50% DoD, and reserve the deep cycles for genuine outages.
Self-discharge works in your favor on seasonal sites. Victron rates this range under 2% per month at 20 °C, so a hunting cabin bank can sit all winter disconnected and come back alive in spring — something lithium with an always-on BMS standby draw does not always manage as gracefully. The flip side: AGM in deficit-charge conditions sulfates and dies young. If the array cannot reach absorption voltage at least a few times a week, fix the charging before you blame the battery.
Charging BAT412201084 correctly
Sealed lead-acid lives and dies by charge voltage. Too low and sulfation eats the plates; too high and you gas off water you cannot replace. Program your inverter-charger or solar charge controller to Victron's published AGM values — on a Victron MultiPlus or an MPPT controller these ship as a preset — and verify with a meter at the terminals on commissioning day:
| Charge stage | 12V setpoint (typical Victron AGM preset) | Purpose |
|---|---|---|
| Bulk | Current-limited (up to ~0.2C recommended for cycle service) | Constant current until absorption voltage |
| Absorption | ≈ 14.2–14.4 V (28.4–28.8 V for a 24V string) | Tops off the last 20%; hold time matters |
| Float | ≈ 13.8 V (27.6 V at 24V) | Long-term standby without gassing |
| Equalize | Not applicable — never equalize sealed VRLA | Equalization belongs to flooded batteries only |
Temperature compensation is not optional. AGM charge voltage should fall about 3–4 mV per °C per cell above 25 °C and rise below it; that is roughly −24 mV/°C on a 12V block. Every Victron charger and controller we sell supports a battery temperature sensor or a Smart Battery Sense. On a bank this size, skipping the temp sensor is a $600 mistake repeated four times over.
Sizing a bank around 220Ah blocks
The arithmetic is the same on every job. Take your worst-case daily load in watt-hours, divide by system voltage to get amp-hours, divide by your chosen DoD, then add aging margin. Worked example — a 24V off-grid cabin drawing 4 kWh/day:
| Step | Math | Result |
|---|---|---|
| Daily load | Given | 4,000 Wh/day |
| Daily amp-hours at 24V | 4,000 ÷ 24 | 167 Ah/day |
| Bank capacity at 40% average DoD | 167 ÷ 0.40 | 418 Ah minimum |
| Add 15% aging margin | 418 × 1.15 | ≈ 480 Ah |
| Batteries required (2 in series = 24V/220Ah per string) | 480 ÷ 220 → round up to 3 strings | 6 × BAT412201084 (24V, 660Ah) |
Six units at 66 kg each is 394 kg of ballast — plan the floor, the rack, and the freight accordingly. This is also the moment to run the comparison against a lithium battery bank: a rack of LiFePO4 at the same usable capacity costs more on the invoice and less over ten years, and it weighs a quarter as much. We sell both cheerfully; the right answer depends on your temperature, your cycle pattern, and your appetite for upfront cost.
AGM vs Gel vs lithium: the honest comparison
| Attribute | Victron AGM (BAT412201084) | Victron Gel | LiFePO4 (e.g., server-rack lithium) |
|---|---|---|---|
| Cycle life @ 80% DoD | ≈ 400 | Higher deep-cycle durability | 3,500–7,000 typical |
| High-current tolerance | Excellent (low internal resistance) | Moderate | Excellent (BMS-limited) |
| Charge acceptance | Good | Slower; voltage-sensitive | Very fast |
| Weight per kWh | ≈ 25 kg/kWh | ≈ 25–30 kg/kWh | ≈ 8–10 kg/kWh |
| Below-freezing charging | Works with temp compensation | Works with temp compensation | Restricted below 0 °C without heating |
| Maintenance | None | None | None (BMS-managed) |
| Upfront cost per kWh | Lowest of the three | Low-mid | Highest |
| Cost per lifetime kWh | Highest of the three if cycled daily | Middle | Lowest |
The pattern we see after hundreds of quotes: AGM wins on standby and low-cycle applications, cold unheated spaces, and tight capital budgets. Daily-cycled off-grid homes almost always pencil out better in lithium over the warranty horizon. Our solar battery buyer's guide walks the full decision tree if you are still on the fence.
Verifying a genuine BAT412201084 before you pay
Gray-market batteries are a real problem in this trade — relabeled second-tier AGM, old date codes sold as new, and outright counterfeits with cloned labels. Five checks that take ten minutes and have saved our customers thousands:
- Match the full part number. The case label, datasheet, and invoice must all read BAT412201084. "Victron 220Ah AGM" without the part number is not verification.
- Confirm the seller is an authorized Victron channel. Victron routes warranty through the selling dealer, so an unauthorized marketplace storefront leaves you holding a dead battery with no claim path. Buy from an established electrical supply house — our Victron Energy catalog is authorized-channel stock with real warranty support.
- Check the date code. Lead-acid ages on the shelf. Ask for the manufacture date before the order ships; anything older than 6–9 months should come discounted and freshly charged.
- Inspect terminal hardware and case finish. Genuine units ship with clean M8 inserts, consistent case molding, and Victron labeling. Relabeled batteries usually betray themselves in the terminal area first.
- Weigh it. A Group 8D AGM at this capacity lands within a kilogram or two of 65.6 kg. A "220Ah" battery that weighs 50 kg is not what the label says.
Installation notes from the field
A few hard-won specifics that the datasheets mention and installers still get wrong:
- Series strings need matched units. Same model, same batch vintage, same state of charge at commissioning. Mixing a new string with a two-year-old string guarantees the old string drags the new one down. If you must expand, add a parallel string of the same age, not a single odd battery.
- Cable the bank diagonally. Take the main positive off one end of the string and the main negative off the opposite end so every battery sees the same cable resistance. It costs nothing and measurably extends bank life.
- Fuse every string. A 220Ah AGM can deliver thousands of amps into a dead short. Class-T or equivalent fusing within 7 inches of the terminal per ABYC practice on marine work, and per NEC 480 and Article 690.71 logic on the solar side.
- Ventilation still matters. Sealed does not mean zero gas — the relief valves exist for a reason. Battery boxes need a vent path, and never install any lead-acid bank in a sealed compartment with ignition sources.
- Torque the M8 terminals to spec. Under-torqued lugs on a high-current bank heat up, and heat on a battery terminal is how fires start. We check every terminal with a torque wrench and mark it with a paint pen before we leave the site.
For the broader wiring side of the install — conductor ampacity, overcurrent protection, and grounding — our NEC wire sizing guide with ampacity charts and the battery installation guide cover the code tables you will be working from.
Where to buy and what to expect on freight
At 66 kg each, these ship LTL freight on a pallet — no exceptions, no parcel carrier. Expect liftgate service if the delivery address has no dock, and inspect the pallet before signing; concealed damage claims on freight are much easier inside 48 hours. Lead times on Victron AGM at this capacity have run from stock to 8–10 weeks depending on the import cycle, so order ahead of the construction schedule, not behind it.
Portlandia Electric Supply stocks and sources the full Victron line alongside AGM batteries, lithium banks, charge controllers, and the balance-of-system hardware to wire them correctly. Contractors can open a Pro Account for wholesale pricing, and our team will build the bank BOM — batteries, cables, fusing, rack — as one quote so nothing shows up missing on install day.
Companion gear that completes the install
A 220Ah block is only as good as what feeds it. The builds we quote around BAT412201084 almost always include a Victron MultiPlus or Phoenix-class inverter-charger, a SmartShunt or BMV-712 for honest state-of-charge metering, Blue Sea or Victron busbars, and Class-T fusing — all stocked in the Victron deep catalog. If you are still weighing capacity, run your load list through our battery sizing calculator first; five minutes there routinely saves a battery's worth of overspend, and the same worksheet scales from a single 12V block to a full house bank.
Frequently asked questions
What battery is part number BAT412201084?
It is the Victron Energy 12V/220Ah AGM Deep Cycle Battery — a sealed VRLA Group 8D block with M8 terminals, roughly 522 × 238 × 240 mm and about 65.6 kg, storing approximately 2.64 kWh at the 20-hour rate.
How long will a BAT412201084 battery last?
Victron rates the AGM range for 7–10 years of design life in float service. In daily cycling, lifespan is set by depth of discharge: roughly 400 cycles at 80% DoD, 600 at 50%, and about 1,500 at 30%. Most real-world banks die early from chronic undercharging rather than old age.
Can I mix BAT412201084 with other batteries in one bank?
No — do not mix chemistries, capacities, or ages in the same bank. Series strings and parallel strings should all be the same model at the same vintage, commissioned at the same state of charge. Mixing drags the whole bank down to its weakest unit.
What charge voltage does this AGM battery need?
Program approximately 14.2–14.4 V absorption and 13.8 V float on a 12V system (double for 24V), with temperature compensation of roughly −24 mV/°C per 12V block. Victron chargers ship with an AGM preset; verify it at the terminals and never equalize a sealed VRLA battery.
Is AGM or lithium better for off-grid solar?
AGM wins on upfront cost, standby service, and cold unheated spaces where lithium cannot charge below freezing. Lithium wins on weight, usable capacity, charge speed, and cost per lifetime kWh in daily-cycled systems. For a cabin cycled every day, lithium almost always pencils out cheaper over ten years despite the higher invoice.
How do I verify a BAT412201084 is genuine and not old stock?
Match the full part number on the case label and invoice, buy through an authorized Victron dealer so the 2-year lead-acid warranty is enforceable, ask for the manufacture date code before shipping, and sanity-check the weight — a genuine unit is about 66 kg, and a suspiciously light one is a red flag.
