Whether you’re powering high-demand torches, headlamps or portable electronics, our 21700 batteries deliver unmatched energy density, extended runtimes and reliable output. Larger than traditional 18650 cells, these high-capacity batteries keep your gear running at peak performance for longer—perfect for outdoor adventures, professional tasks and tech-savvy applications.
Popular 21700 Battery Options
-
Fenix 21700 5,000 mAh Li-ion rechargeable battery for consistent, high-drain performance
-
Olight 21700 5,000 mAh customised rechargeable cell with rugged packaging and reliable cutoff
-
Klarus 21700 5,000 mAh rechargeable Li-ion battery offering balance of capacity and durability
-
EagTac 21700 protected rechargeable 5,000 mAh Li-ion cell with built-in safety circuitry
-
KeepPower 21700 Type-C rechargeable 5,000 mAh Li-ion battery (8 A discharge) for fast field top-ups
-
KeepPower 21700 protected rechargeable 5,300 mAh Li-ion battery (10.6 A discharge) for maximum runtime
-
Fenix 21700 USB-C rechargeable Li-ion battery 5,000 mAh with integrated charging port
How to Choose the Right 21700 Battery
-
Capacity (mAh): Higher mAh delivers longer runtime—choose 5,300 mAh for extended use or 5,000 mAh for balanced performance.
-
Protected vs. Unprotected: Protected cells include safety features against over-charge, over-discharge and short circuits; unprotected cells offer slimmer profiles and maximum capacity.
-
Recharge Method: USB-C integrated batteries eliminate the need for an external charger in the field; traditional cells pair with smart chargers for balanced cell health.
-
Discharge Rate (A): Match the amp-hour discharge rating to your device’s draw—higher amp ratings sustain peak output under heavy loads.
-
Brand Reputation: Opt for reputable manufacturers to ensure voltage stability and minimise premature wear.
Care & Maintenance Tips
-
Store cells in a cool, dry place using plastic cases to prevent accidental short-circuits
-
Use a quality smart charger or approved USB-C port to maintain optimal battery health
-
Rotate your battery stock periodically and replace cells showing reduced capacity or damage
-
Clean terminals with a dry cloth before installation to ensure solid electrical contact
Warranty & Delivery
Enjoy free shipping on Australian orders over $150, same-day dispatch on in-stock items, click-&-collect from Geelong, plus our Australian warranty and a 30-day returns policy for complete peace of mind.
Ready to power your most demanding devices? Browse our full range of 21700 batteries now and never run out of energy.
