They’re built for different jobs. A 3.7V battery is typically a rechargeable lithium‑ion cell used in electronics that specify one lithium cell, while AA batteries are usually 1.5V alkaline or 1.2V NiMH and sized for AA compartments.

• Voltage: 3.7V lithium cells run at a higher nominal voltage than AA.
• Shape/size: 3.7V options include cylindrical sizes (like 18650) and flat lithium‑polymer packs, not the AA shape.
• Charging: Lithium cells require compatible chargers made for 3.7V chemistry.
• Compatibility: They aren’t drop‑in replacements for AA-powered devices unless the device specifically supports them.

Always follow your device’s battery specifications to avoid damage.

You can shop a wide range of 3.7V rechargeable batteries on Walmart.com in the Electronics category. To narrow options, use filters and search terms.

• Search tips: Try “3.7V battery” plus your device type or model number.
• Filter by use: Look for choices for cameras, drones, flashlights, grooming tools, game controllers, speakers, radios, and smart home panels.
• Specs to filter: Capacity (mAh), battery format (cylindrical vs. flat pack), and connector type (e.g., 2‑pin 2.0 mm plug).
• Fulfillment: Check shipping, pickup, or delivery availability.

Selection and in‑store stock can vary by location, so online availability is a helpful starting point.

They’re common single‑cell power sources for many portable electronics. On Walmart.com, you’ll see 3.7V batteries for:

• Cameras and gimbals: Point‑and‑shoots and stabilizers often use compact Li‑ion cells.
• Drones and RC toys: Lightweight packs power motors and electronics.
• Flashlights and headlamps: High‑output lights often use cylindrical cells.
• Grooming tools: Cordless clippers and shavers use rechargeable packs.
• Gaming controllers: Some controllers use 3.7V replacements.
• Speakers, radios, and smart panels: Portable audio and home devices use pouch or cylindrical cells.

Because specs vary, always match the battery’s voltage, size, connector, and capacity to what your device manual lists.

It’s essentially one lithium‑ion cell with a nominal voltage around 3.6–3.7V (and a typical full charge around 4.2V). “Equivalent” usually means a single‑cell lithium‑ion or lithium‑polymer pack—not the same as 1.5V AA or 3V primary batteries.

• Common formats: Cylindrical cells (such as 18650) and slim lithium‑polymer packs.
• Descriptors you may see: “1S Li‑ion” or “1S Li‑po” indicating one cell in series.
• Connectors: Packs may come with various 2‑pin plugs; match your device’s connector and polarity.

Always confirm the exact format, dimensions, and connector your device requires—voltage alone doesn’t guarantee compatibility.

A quick checklist can help you match your device’s needs without guesswork.

1. Confirm specs: Check the manual or old battery for voltage and model ID.
2. Match format: Choose the correct shape and size (e.g., 18650 vs. flat pack) so it fits the compartment.
3. Connector & polarity: Ensure the plug type and wire order match (many use 2‑pin 2.0 mm plugs).
4. Capacity (mAh): Higher mAh can extend runtime if the battery fits and meets device requirements.
5. Charging: Use a charger designed for 3.7V lithium chemistry and the specific cell type.

If you’re unsure, compare product details on Walmart.com with your device’s documentation before purchasing.