Caution:- Do not over-discharge/overcharge- Recharge empty batteries ( resting voltage ~3.6V ) as soon as possible. Leaving LiIon batteries in discharged state will incur irreversible damage ( capacity / cycle loss )- Do not short circuit ( will release tremendous current )- Do not dispose of in fire.
Never store batteries in your pocket with other metal objects like coins or keys. This can short out the battery and cause a hazard. Batteries should be stored in a safe area away from metal objects or in a plastic storage container.
Attention : These IMR cells have much lower internal resistance than regular LiIon 3.7V cells and they may end up with a higher ending voltage when charged in certain chargers ( especially older version WF-139 charger ). Please check the voltage of them right out of the charger to see if they are above 4.20V when fully charged with your charger. Overcharging above 4.25V may shorten life/cycles. Above 4.50V may even pop them or making them leak. DO NOT use the charger if it seems to overcharge IMR cells