When Should You Replace Your 18650 Battery?

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Wondering if it’s time to replace your mod battery? Charging and changing your battery are simple. When done correctly, there is low likelihood of any issues. That said, it’s important to be attentive. Human error is the biggest cause of unexpected performance.

To determine whether it’s time to replace your battery, consider these factors:

How Long Does it Take to Charge an 18650 Battery?

Charge time for 18650 batteries is one of the most noticeable ways to estimate battery health. Charge time should be consistent. Longer charge times are usually the first sign you should consider replacing a battery. It generally takes about 4 hours to charge an 18650 mod battery using a separate charger. If you use a Micro USB charger, it is likely to take about three hours. However, be advised that there can be some slight variance in charging times, even for a new battery.

Once you’ve used the battery for a few days, you should have a sound idea how long it will take to charge. As the battery gets older, charging takes longer and the ability to hold a charge between uses will diminish.

When charging time gets longer, it is a good idea to replace your mod’s 18650 battery. The batteries are built to stand up to consistent use over a long time – but once performance starts to degrade, it will only get worse.

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Check Physical Condition

Your 18650 mod battery is a precision part that should be free of damage, defects and wear. If you notice physical damage, it is a good idea to replace your battery with a new one that will be more reliable in the long term.


Dents can occur if the battery is dropped, either on its own or while inside the device. Any type of deformity that changes the shape of the battery will impair its electrical properties, so you should change it out as soon as you can.


Scratches can sometimes be superficial and will not cause major performance issues. Still, if a scratch appears particularly long or deep – or if you simply don’t like the looks of it – it is always better to be safe than sorry.


“Wrap” generally refers to heat shrink wrap tubing for your battery. This can come in the form of a large roll or it can be pre-cut. No matter what the case, however, you should replace wrap that has become visibly damaged. This is essential to the battery’s thermal regulation.

Accidental Misuse

Accidents happen, so “accidental misuse” can cover a lot of ground. Maybe your hand slips and you drop the battery. Maybe it gets submerged in water, or gets grit in it as a result of a trip to the beach. Whatever the case, this is usually cause for a replacement.c

Improper Charging

You should always use charging cables and devices that are indicated for use with your vape. There is certainly an aftermarket of charging technology and “modded” chargers out there, but it is best to avoid them. Be particularly alert to chargers or cables that seem to run hot.

Improper Storage

Batteries can become damaged as a result of improper storage. The most common issue is when the battery is stored in a location that is not dry or that receives too much direct sunlight. Storage in places that are too hot or too cold can also cause problems.

When in doubt, it’s always better to err on the side of caution and replace your battery. You can visit a local VaporFi store with questions or call our customer service line for help with your specific issues.

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