New batteries, please adjust to their discharge state, prior to their first use, please charge (about 12 hours). After your condition instruction the new batteries can be recharged 2-3 times and finally discharged, so that its maximum capacity is reached.
If you are not using your batteries in the long term, they should be removed from your device and stored in a dry, cool and clean place.
Normally the batteries are heated during their charging and discharging cycles.
Finally, a charged battery will lose its charge when not in use. It may therefore be necessary to recharge the battery after a storage period.