Roberts Opus Manual page 30

If you intend not to use your radio for some months, then we recommend
that the batteries are removed and put away, keeping them in a cool
place out of reach of children, away from moisture and such that no metal
object can contact the battery terminals.
With care, rechargeable batteries can last a long time and can operate for
many hundreds of charge and discharge cycles. When your rechargeable
batteries can no longer power your radio adequately, please dispose of
them thoughtfully.
To avoid danger and risk of injury, please follow
these guide lines
Improper use of batteries may result in leakage of fluid, overheating
or explosion. Battery fluid is corrosive and may also be toxic. Battery
fluid can cause skin burns, can damage the eyes, and can be harmful if
swallowed.
1. Keep batteries out of the reach of children.
2. Do not heat, open, puncture, mutilate or dispose of batteries by
burning.
3. Do not mix different battery types or old and new batteries. Always
replace all the batteries at the same time.
4. Do not carry or store batteries such that metal objects may contact
the end caps.
5. Remove batteries from the radio if they are worn out or if you are
storing it for a long time.
6. Remove old or worn out batteries promptly, and recycle or dispose of
them according to the regulations applicable to your location.
7. If a battery does leak, remove all batteries from the product, taking
care to avoid directly touching the leaked fluid. If the fluid contacts
skin or clothes wash with water immediately. Before inserting new
batteries, thoroughly clean the battery compartment with a damp
paper towel, or follow the battery manufacturer's advice for clean up.
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