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TrustFire 10440 Unprotected 600mAh

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Note: Canada Post does not allow Air shippment of Lithium Batteries.

This is an unprotected battery. This means it is truely the size it claims but has no protection against shorts, over charging and overdischarging. Monitor the battery while charging (use of a smart charger is recommended) and make sure to stop use of the battery before it has fully drained (if the device stops functioning, pull the battery right away). When storing the battery, secure it in a location that will not allow the ends of the batteries to make contact with any conductive material (including other batteries) to avoid shorting while in storage. When transporting the battery, secure the battery such that the ends cannot come in contact with conductive materials - even if the battery is 'depleted'.

The battery still has a valve to release pressure (gasses) in the case that the battery should overheat due to over charging or short. If the valve is triggered, the battery will be useless.

Chemistry: Lithium Ion

Classification: Unprotected 10440

Size: 10440

Build: Cell, Button Top

Weight: 20 g

Height: 44 mm

Diameter: 10 mm

Quantity Per Pack: 1

Nominal Voltage: 3.7 V

Nominal Capacity: 600 mAh

Operating Temperature: -20°C ~ 60°C

Self Discharge Rate: ~10% per month

Recharge Cycles: 200 - 500

Over Discharge Protection: None

Over Charge Protection: None


  • Environment Temperature: 0°C to 45°C


  • Less than 30 days: -20°C to 45°C
  • Less than 90 days: -20°C to 35°C
  • Less than 1 year: 0°C to 25°C
  • Best: 10°C to 15°C
  • Humidity: 60 ± 25% R.H.
  • When leaving Li-Ion batteries in storage, recharge every 9 months to ensure battery is still functional.
  • When using Li-Ion batteries that have been in storage for over 5 months, it is recommended to recharge the batteries. Li-Ion batteries in storage for over 9 months will require recharging before use.


No Memory Effect Capacity Loss - Recharging a Li-Ion battery before it has been fully discharged will not reduce the storage capacity of the battery.

No Over Discharge Leakage - While Alkaline batteries will eventually leak when over discharged, Li-Ion batteries will not.


Over Discharge - If a Li-Ion battery is over discharge it might not be able to be recharged. Protected Li-Ion batteries have a circuit that prevents over discharge.

Over Charging - If a Li-Ion battery is over charged or charged too fast, it may over heat and trigger a safety built into the battery (such as a pressure release valve or charge connection) that will render the battery useless. Most chargers have measures to prevent over charging and over heating of L-Ion batteries. Protected Li-Ion batteries have a circuit that prevents over charging.

Do not expose any batteries to flame or other extremely high temperatures.

Do not store batteries in direct sunlight.

Internal voltage regulation achieves working voltage of 3.0V - will drop when near fully discharge and will be above (up to 4.5V) when near fully charged. Make sure the device can handle 4.5V before using this battery in it.


Unprotected Battery Risks :

Over charging a Li-ion battery is highly likely to cause the battery to overheat and rupture. To reduce the risk of this happening, use a charger that displays the voltage level of the battery during recharge and closely monitor the levels during charge, removing the battery between 3.7V and 4.2V. A 'smart' charger, that stops charging the battery when fully charged, may also be used to reduce the risk of an over charge occuring. Note, the 'last little bit' of charging a Li-ion battery is quicker than the rest of the charge cycle, monitor closely as the battery approaches 3.7V charge level.

You must have a charger that is rated to charge a 10440 Li-ion Battery. Most chargers charge at too high of a voltage rate for the reduced capacity of a 10440 battery. Charge at your own risk. Never charge your 10440 battery unattended.

Over discharging a Li-ion battery will damage the storage capacity of the battery. This is not a 'memory' effect. In rare cases an overdischarged battery may rupture or explode.To reduce the risk of this occuring, any indication that the battery is almost discharged (light output level of flashlight reduced or flashlight turns off automatically) remove the batteries from the device right away. Do not attempt to fully discharge an unprotected Li-ion battery. Recharging a battery before it is fully depleted will not harm the battery and may allow additional recharge cycles.

MackOutdoors is not responsible for improper handling of unprotected batteries by the customer. The customer is responsible for proper care in charging, discharging, installation and storage of batteries.