Replacement Battery Guide: How to Identify the Right Battery for Your Device

Losing track of your original battery model is more common than you think.

Whether it’s a POS terminal, barcode scanner, handheld PDA, medical device, or industrial equipment, battery labels fade, manuals get misplaced, and suddenly you’re left guessing which replacement battery actually fits.

Many buyers make the mistake of ordering a battery that “looks similar.” Unfortunately, this often leads to unstable performance, compatibility issues, or even safety risks.

As a professional B2B replacement battery supplier, we help customers solve this problem every day. The good news? Identifying the correct replacement battery doesn’t have to be complicated.

Here are three proven methods to help you find the right battery—quickly and accurately.

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Method 1: Check the Original Battery (Most Reliable)

If you still have access to the old battery, this is always the fastest and safest option.

1. Read the Battery Label

Remove the battery and inspect any printed information carefully. Pay attention to:

• Model or Part Number
  Examples: ERP-B, NB-11L, LGC18650HE2.
  This is the most precise identifier.

• Electrical Specifications
  Voltage (V) and capacity (mAh/Ah), such as 3.7V, 7.4V, 12V, or 2600mAh, 5Ah.

• Physical Size and Shape
  Cylindrical (like 18650), lithium polymer pouch, or custom packs.
  Measure length, width, and height in millimeters if needed.

2. Inspect the Battery Compartment

Some manufacturers print battery information inside the battery bay. Use a flashlight to check the inner walls or connector area.

3. Review the Original User Manual

If available, look under “Specifications” or “Replacement Parts.” Many manuals list the exact battery model.

Pro tip:
Once you have the part number, simply search it online or send it to your battery supplier for an exact replacement match.

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Method 2: Identify the Battery Using Device Information

No old battery? You can still work backward from the device itself.

1. Confirm Device Brand and Model

Locate the device nameplate (usually on the back or bottom). Examples: “Zebra TC52,” “Honeywell Dolphin 75e.”

Search using:

Device model + battery
Device model + replacement battery

Most mainstream devices already have documented battery references online.

2. Check the Manufacturer’s Website

Visit the official support or accessories page of the device brand. OEM part numbers are often listed under compatible accessories.

3. Ask a Professional Battery Supplier

Send clear photos of your device and battery compartment, along with the model number. Experienced suppliers maintain large device–battery databases and can usually identify compatible packs quickly.

This saves time and avoids trial-and-error purchases.

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Method 3: Match by Physical Size and Connector (Last-Resort Method)

When all labels are gone, physical matching becomes essential.

1. Measure the Battery Compartment

Use calipers to measure:

• Length

• Width

• Height

• Connector position and polarity

Precision matters. Even a 2–3 mm mismatch can prevent installation.

2. Estimate Electrical Requirements

If your device adapter shows “DC 12V input,” the internal battery is likely around 10.8V or 12V. This helps narrow down the correct configuration.

3. Let Professionals Confirm

Provide measurements, connector photos, and device type. A qualified supplier can recommend batteries with matching dimensions, voltage, capacity, and protection circuitry.

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Quick Selection Guide

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Beyond Matching: Why Your Supplier Matters

Finding a compatible replacement battery is only the first step—especially for commercial or industrial applications.

You also need:

• Reliable quality – Stable discharge performance and proper safety protection

• Consistent supply – No production delays caused by discontinued batteries

• Cost efficiency – Competitive pricing without sacrificing reliability

This is where professional B2B battery partners add real value.

At Cowon, we specialize in replacement batteries for POS systems, scanners, handheld devices, medical equipment, and industrial electronics. Every pack is built with qualified cells, tested before shipment, and supported with long-term supply capability.

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Not Sure Which Battery You Need?

Simply send us:

• Device brand and model

• Or battery compartment photos and dimensions

Our engineering team will help identify the correct replacement battery and provide quotation and samples—free of charge.

Contact us today and get your device powered again with confidence.