Amazon Basics Button Cells

Amazon Basics offers the essential button and coin cells most small electronics use: lithium CR series (3V) and alkaline LR series (1.5V). Clear labeling and multi-pack options make it easy to match codes, stock spares, and keep key fobs, scales, calculators, sensors, and toys running reliably.

When to Choose CR vs. LR

• Choose CR (lithium, 3V) for key fobs, bike sensors, scales, computer motherboards (CMOS), and devices stored for long periods or used in colder environments. Lithium coin cells offer flatter voltage and longer shelf life.
• Choose LR (alkaline, 1.5V) only if your device specifically calls for LR/AG/A76 types. Common in calculators, small toys, and pointers. Note: many watches and instruments prefer silver‑oxide (SR) cells, not LR.

Common Sizes and What They Fit

Select the Right Cell

1. Match the code: Use the code on the old battery or device manual. For CR codes, the first two digits are diameter (mm), the last two are thickness (e.g., 2032 = 20 × 3.2 mm).
2. Match chemistry and voltage: CR (3V lithium) is not interchangeable with LR (1.5V alkaline). Do not downgrade SR (silver‑oxide) to LR unless the device allows it.
3. Do not force a fit: An “almost right” size can cause poor contact, resets, or damage.
4. Handle carefully: Use non-metal tweezers if contacts are delicate; avoid shorting the terminals.

Installation Checklist

1. Power off the device if possible and open the battery door carefully.
2. Remove residue or corrosion with a dry cotton swab; do not use liquids on contacts.
3. Observe polarity (+/−) markings and seat the cell flat under any retaining clip.
4. Close the door fully and test the device before reassembling covers.

Expected Runtime (Typical)

• Key fob (CR2032): 1–3 years depending on use and signal strength.
• Digital scale (CR2032/CR2025): 6–18 months with weekly use.
• Bike sensor/HR strap (CR2032): 6–12 months at a few hours/week.
• Calculator (LR44): 1–2 years of school use; longer for intermittent use.
• Pointer or toy sound module (LR44): several hours of active, continuous use.

Actual runtime varies with device load, temperature, and storage conditions. Lithium coin cells generally maintain voltage better under pulse loads than alkaline LR types.

Storage & Shelf Life

• CR (lithium): up to ~8–10 years sealed shelf life at room temperature (68–77°F / 20–25°C).
• LR (alkaline): typically ~3–5 years sealed shelf life.
• Store cool, dry, and in original packaging; label purchase date and avoid mixing loose cells with metal objects.
• Do not refrigerate or freeze unless the manufacturer specifically recommends it.

Safety & Disposal

• Ingestion hazard: Keep out of reach of children and pets. If swallowed, seek immediate medical attention.
• Do not recharge, puncture, or short-circuit button cells.
• Tape terminals of spent cells before disposal to prevent shorting and take them to a battery recycling point where available.
• Remove depleted cells promptly to reduce risk of leakage (more common with alkaline LR types).

FAQs

Can I use a CR2025 instead of a CR2032?

No. While the diameter matches, the CR2025 is thinner and has lower capacity. It may make poor contact or reduce runtime. Use the size specified by your device.

LR44 vs. SR44 (357): which should I choose?

Follow the device manual. SR44 (silver‑oxide) provides steadier voltage and longer life, preferred for watches and precision instruments. LR44 (alkaline) is acceptable only when specified.

Why does my device still not work after replacement?

Check polarity, ensure the cell is fully seated under the clip, and inspect contacts for corrosion. Some remotes require re-pairing after a battery change.

Do coin cells leak?

Alkaline LR cells can leak when fully discharged or stored hot. Lithium CR cells are less prone but still require proper storage. Remove depleted cells promptly.

Are these rechargeable?

No. Non-rechargeable CR and LR cells must not be recharged. Rechargeable coin cells are labeled differently (e.g., LIR/ML) and have different voltages.