dyras RCSH-980, Instruction Manual

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RCSH-980
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4. When the battery is fully charged, use the appliance as normal
until the battery is completely flat. Recharge it for 20 hours.
Repeat this process again; running the battery completely
flat before charging it for 20 hours. The battery has now been
conditioned.
5. After the battery has been conditioned you’ll only need
to charge a flat battery for 16-20 hours. It’s also no longer
necessary to wait until the battery has run down completely
before charging. Never leave the appliance on charge for more
than 24 hours because this could damage the battery.
6. Rechargeable batteries lose their capacity to hold charge as
they get older, even if they are charged carefully. The battery
in your appliance will need to be replaced when it no longer
holds its charge for an acceptable time. Battery replacement
can be carried out at an authorised service centre.
The appliance cannot be used when it is being charged.
Before use, unplug the power cable from the mains
socket and then unplug the other end from the
appliance.