Denver PBA-4001 Manual Del Usuario página 22

13. Please charge and discharge the product once every three months if it is not used
for a long time. This can ensure the life cycle of the product.
14. Once discharged, please recharge the product fully so as to prepare for later use,
for example, for charging digital products.
15. Unplug the power cable when not using the product, so as to avoid injury or
property loss.
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