Li-ion Batteries
Knowing some fundamentals li-ion batteries will help to ensure that you maximise the life of your cells.
While li-ion batteries are fairly robust, they are potentially susceptible to damage particularly from severe
impact, temperature and water ingression. Our lamps have been designed to best protect the battery, while
maintaining a practical helmet mounted solution for underground use. If carrying spare batteries, take care
to avoid severe impact and water as they will potentially break. A hard case waterproof container is probably
advisable.
We do not take responsibility for injury to persons or damage to property from cells or chargers. These
should be used and charged under supervision, stored safely, appropriately maintained and correctly
disposed of if there is any suspicion that they have been damaged or are defective.
Battery Charging
Although the charging algorithm for li-ion cells is relatively complex, this is typically sorted out by the charger
and battery protection circuitry. Consequently, chargers are invariably simple plug in and go solutions. Red
light charging, green light fully charged, with automatic charging shut off. Li-ion batteries can be part
discharged or part charged without consequence. There is fundamentally no rapid high current charge
option for li-ion cells (though they will reach 80% charge fairly quickly). Although charging is automatically
shut off on completion, it is always advisable to disconnect battery packs from chargers when charging has
finished.
Battery Storage
The capacity of li-ion batteries is reduced with age. The chemical process that relates to this is accelerated
with increased temperature and charge level. To realise maximum battery life, cell packs should be stored
around half charge and in a cool and dry environment (around 15 degC, do not freeze). Under no
circumstances should battery packs be left discharged for an extended period, in order to avoid self
discharge below 2.5v and permanent damage.
Battery Compatibility
Nora4 operates from 3.7v li-ion, and is not compatible with high voltage li-ion battery arrangements,
typically ranging from 7.4v to 14.8v, connection to which could result in damage. Always ensure correct
battery polarity, to avoid potential damage to lamp.
Li-ion Battery Summary
Avoid getting batteries wet
Avoid severe impact. Do not puncture.
Store batteries somewhere cool, around 15 degrees C
Store batteries part charged, around 50% is good
Do not store batteries discharged (as deep self discharge will kill them)
Do not store batteries connected to lamp
Use a Little Monkey charger, or a suitable equivalent
Keep a watch on general battery condition (avoid damage to leads and connector)
