How do you read date codes on lithium batteries?

The first five numeric characters represent the month, day, & year of manufacture (MM/DD/Y). The second two digits designate the day of the month, from 01 to 31. The fifth digit designates the year from 0 to 9.

What is the shelf life of 18650 batteries?

Rechargeable lithium-ion batteries, such as the 18650 battery, boast remarkable service life when stored at 3.7V—up to 10 years with nominal loss in capacity.

Are all 18650 batteries 3.7 V?

18650s may have a voltage range between 2.5 volts and 4.2 volts, or a charging voltage of 4.2 volts, but the nominal voltage of a standard 18650 is 3.7 volts. There are two types; protected and unprotected. We absolutely recommend protected cell 18650 batteries. The average 18650 battery charge time is about 4 hours.

Do 18650 batteries go bad?

The battery will lose a charge on the shelf must faster than normal. It loses it’s charge after a couple of days or even worse overnight. The battery gets hot when charging or discharging, warmer than normal. You have used the battery frequently over 2 to 3 years.

How do I know my battery mAh?

Each time you charge your device, the app records its estimated battery capacity. When you first sign up for the app, AccuBattery looks up your battery’s design capacity (your battery’s output when it’s new). By comparing these two figures, you can see how much capacity (mAh) your battery has lost over time.

How can I tell if my 18650 battery is old?

If you see a Panasonic 18650 battery has dot matrix on its top, it must be very old and be manufactured before 2009. No matter new or old version, the same date code rule is followed. You saw the 4 numbers (sometimes numbers+letters) on the bottom of the battery?

How to recognize the date code early Samsung 18650 batteries?

It’s very easy to recognize the date code early Samsung 18650 batteries. There’ re 3 lines on the battery body and the third line is the date code.The first digit = Year, the second digit = Month, and the third digit = Week. However, from the year of 2010, Samsung changed its code rules.

What is the difference between old and new Panasonic 18650 batteries?

New version of Panasonic 18650 Battery has 2 bars – a narrow bar and a wide bar. But the old version only has one narrow bar on the PVC. If you see a Panasonic 18650 battery has dot matrix on its top, it must be very old and be manufactured before 2009. No matter new or old version, the same date code rule is followed.

What does 3 mean on a battery number?

It seems that, 3 means the day of 03, 13, and 30 at the same time. So can be figured out that it was manufactured in July, 2014. The battery below is from SDIEM, and also has 4 digits. 1.