3.7V lithium rechargeable batteries for remote control

Storage temperature and charge:

Storing a lithium-ion battery at the correct temperature and charge makes all the difference in maintaining its charging capacity. The following table shows the permanent charge loss that occurs with storage at a given charge level and temperature.

Permanent Capacity Loss against Storage Conditions

Storage temperature 40% Charge 100% Charge

0°C (32°F) 2% loss after 1 year 6% loss after 1 year
25 °C (77 °F) 4% loss after 1 year 20% loss after 1 year
40°C (104°F) 15% loss after 1 year 35% loss after 1 year
60°C (140°F) 25% loss after 1 year 40% loss after 3 months

There is a significant benefit to avoiding storing a fully charged lithium-ion battery. A Li-Ion battery deposited at 40% charge will last many times longer than one deposited at 100%, particularly at high temperatures.
If a lithium-ion battery is stored with too little charge, there is a risk of allowing the charge to fall below the low-voltage threshold, resulting in an unrecoverable battery. Once the charge has dropped below this level, recharging it can be dangerous. An internal safety circuit will open to prevent charging, and the battery will be completely unusable for all practical purposes.
In circumstances where a second lithium battery is available for a certain instrument, it is recommended that the unused battery be discharged to 40% and placed in the refrigerator to prolong its shelf life. Batteries should be given time to warm up to room temperature for 24 hours before each charge or discharge.

Safety issues.

PRECAUTIONS:

Lithium-ion batteries can easily rupture, catch fire or explode when exposed to high temperatures, or direct sunlight. They should not be kept in the car during hot weather. Shorting a lithium battery can cause fires and explosions.

The container of a Li-Ion battery should never be opened for any reason, they contain safety devices that protect the batteries, if damaged, these can also cause the battery to catch fire or explode.

ATTENTION:
Exhausted batteries must be disposed of in an environmentally friendly manner, using the special containers made available by the public solid waste collection service.