21700 batteries are rechargeable, lithium-ion batteries.
They have a higher capacity and power output than 18650 batteries, and, for these reasons, are considered an upgrade.
21700 batteries are widely used in smaller, portable electronic devices, and power some newer models of flashlights. They're compact, bright, and long-lasting, making them an ideal source of illumination.
In order to harness the 21700 battery's impressive energy capacity, you’ll need to properly charge them. By understanding the 21700 battery’s charger hours and usage, you’ll be able to make a careful, informed choice on the type of charger you buy.
21700 Versus 18650 Batteries
The battery capacity of an 18650 is limited because of its size.
A moderate increase in length and diameter, as seen in the 21700, allows for a maximum capacity of 5000mAh, as compared to the 18650’s 3600mAh. This translates to extended run times on a single charge.
Since the size increase is minimal, 21700 batteries still fit in most tools and accessories. 18650 batteries, on the other hand, won’t fit into devices specifically designed to fit their newer counterpart.
The Best Type of 21700 Battery Charger
Understanding the 21700 battery’s charger hours and usage will help you make the best possible choice of charger.
The ideal charger is one that charges your batteries in a safe, efficient way.
You'll want to charge your batteries in the shortest time interval possible but avoid damaging them.
Chargers with an adjustable charging current allow you to adjust the amount of current you want the battery to draw from its charger.
The Charge Length of a 21700 Battery
The amount of time your battery takes to charge depends on its capacity and charger speed. The average charging time of a 21700 battery can range anywhere from 1.5 to 4 hours.
It might be tempting to get a fast charge, but, when possible, it’s better to use lower amp chargers. This reduces the likelihood of damaging your batteries.
When it’s charged with a slightly lower current, the battery's charge tends to last longer.
If you're not in a rush, using 1A chargers can be more efficient in the long run. A slower charge will increase your battery's charge cycle and save you money on battery replacements.
How To Choose a Charger
When you’re purchasing a charger, you’ll need to know the maximum continuous discharge current of your batteries.
This way, you can get a charger with a current strong enough to charge them without accidentally inflicting damage.
Most chargers have multiple charging slots that vary in charging currents. You’ll want to place your battery in the appropriate slot.
To prevent damage, avoid leaving batteries in the slot for an extended period. If possible, remove them immediately upon reaching their full charge.
For a safe, speedy way to charge multiple batteries at once, come and browse through Search & Recovery Engineering’s wide selection of high-quality Nitecore chargers.