Battery chargers are crafted, not found lying around

You cannot pick up a battery charger as loot in Subnautica. Instead, you build one using the Fabricator — the crafting machine in your base or lifepod. To make a battery charger, you need the schematic first, then the right materials on hand.

The battery charger itself does not hold power. It is a wall-mounted device that charges batteries and power cells when you place them inside it. Once built, you can mount it on any wall in your base, and it will slowly recharge any battery or power cell you put in it as long as your base has power flowing through it.

Key Takeaways

  • You unlock the battery charger schematic by scanning the device itself in wrecks or by reaching a certain depth in the game.
  • Building a battery charger requires 2 copper ore, 1 gold, and 1 computer chip, all crafted or gathered before you can make it.
  • The battery charger must be placed on a wall in your base and connected to a power source like a solar panel or bioreactor.
  • You can craft multiple battery chargers in different rooms to charge several batteries at once.

How to unlock the battery charger schematic

The battery charger schematic appears in your PDA once you scan an actual battery charger device. These are found in wrecks scattered across the ocean floor, particularly in the Safe Shallows and Kelp Forest areas. When you swim near one, your scanner will highlight it and let you scan it from a distance.

Alternatively, you unlock the schematic automatically once you reach 200 meters depth. If you have not found a wreck with a battery charger by the time you explore that deep, the game grants you the blueprint anyway. This is a safety net so you do not get stuck unable to craft one.

Gathering materials for the battery charger

Once you have the schematic, you need to collect four materials: 2 copper ore, 1 gold, and 1 computer chip. Copper ore is common in shallow areas — look for small copper deposits on rocks and in caves. Gold is rarer and usually found deeper, often in the Kelp Forest or in wrecks themselves.

The computer chip is the trickiest part. You cannot find raw computer chips lying around. Instead, you craft one at the Fabricator using 1 gold and 1 table coral sample. Table coral grows in the Safe Shallows and Kelp Forest. This means you actually need 2 gold total — one for the computer chip and one for the charger itself.

Building and placing your battery charger

Once you have all materials, go to any Fabricator in your base or lifepod. Search for "battery charger" in the crafting menu and select it. The Fabricator will consume your materials and produce the device. This takes a few seconds.

After crafting, you hold the battery charger in your inventory. Enter your base, look at any empty wall space, and place it like you would place any other wall-mounted item. The charger will snap into place. It does not need to be in a specific room, but it must be inside a structure with power running through it.

Powering your battery charger

A battery charger only works if your base has power. The most common early-game power source is a solar panel, which you can craft and place on the roof of your base. Solar panels generate power during the day and store it in a power cell. As long as your base has power flowing, any battery charger you place will slowly charge batteries and power cells inside it.

If you place a battery charger in a room with no power, it will not charge anything. Check your base power status by looking at the power indicator on your base control panel. If the indicator is red or empty, you need to add more power generation or repair broken power conduits.

Using your battery charger efficiently

Place batteries and power cells into the charger by looking at it and pressing the interact button. The charger will hold multiple items and charge them one at a time. Charging is slow — a dead battery takes several minutes to fully charge. Plan ahead and leave batteries in the charger overnight or while you are out exploring.

You can craft and place multiple battery chargers in different rooms if you need to charge many batteries at once. This is useful if you use a lot of power tools or if you have multiple vehicles that need power cells. Each charger draws a small amount of power from your base, so make sure your power generation can handle it.

Alternatives if you do not have a base yet

Early in the game, before you build a base, you cannot use a battery charger because you have nowhere to place it. Instead, carry spare batteries and power cells in your inventory. Swap them out when one runs low. Once you build your first base — even a small one with just a few rooms — you can craft and place a battery charger when ready.

If you are still in the lifepod at the start of the game, you can craft a battery charger there too, as long as you have the materials. The lifepod has a Fabricator and power, so it works as a temporary charging station until you build a larger base.

Frequently Asked Questions

Can I find a battery charger already built in a wreck?

No. Battery chargers only appear as wall-mounted devices in wrecks so you can scan them for the schematic. You cannot take a built charger and move it to your base. You must craft your own using the Fabricator.

How long does it take to charge a battery?

A fully drained battery takes roughly three to five minutes to charge completely in a battery charger. The exact time depends on how much power your base is generating. If your base power is low, charging slows down.

Do I need a battery charger if I have a power cell charger?

They are different devices. A battery charger charges small batteries used in tools and flashlights. A power cell charger charges power cells used in vehicles and larger equipment. You will want both eventually, but the battery charger is usually built first.

What happens if my base loses power while something is charging?

The charger stops working when ready. The battery inside stays at whatever charge level it had reached. Once you restore power to your base, the charger resumes charging from that point.

Can I place a battery charger outside my base?

No. Battery chargers only work when placed on walls inside a structure. Placing one outside or in open water will not function, even if you have a power source nearby.