xsto DC Series Operation Manual page 48

Charger hole
Battery instructions and precautions
（1） Storage
When the battery pack to be long-term stored, charge the battery
pack to about 50% capacity,store in dry and ventilated place, charge
for every 3 months.
The battery pack and charger should be stored in clean, dry and
ventilated place, avoid contacting with corrosive materials and be
away from fire and heat.
The charging temperature range is 0-40℃. If the range is exceeded,
the battery performance will be reduced and the battery life will be
reduced.
2. pull out the battery pack
3. Connect the charger
4. Please follow instructions
when charging.
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