Sangean DPR-77 Mode D'emploi page 23

A Few Words about Batteries...
Your radio has been designed to use a choice of power sources.
You may plug it into the mains using the supplied high-efficiency
adaptor, or for listening away from the mains you may use either
alkaline or rechargeable batteries. We do not recommend the use of
carbon-zinc or zinc-chloride batteries.
It is very important that you read the advice and warnings giv-
en below.
1) Whichever type of batteries you choose to use, it is very important
that the battery selection switch under the cover is set to the
correct type.
a. If no batteries are fitted, then set the switch to the Alkaline position
(to the left as viewed from the back of the radio). This position
minimises the power consumption when the radio is powered
from the mains.
b. If Alkaline batteries are fitted, then set the switch to the Alkaline
position (to the left as viewed from the back of the radio).
c. If Rechargeable batteries are fitted, then set the switch to the
NiMH position (to the right as viewed from the back of the radio).
Your radio is designed to use Nickel-Metal-Hydride rechargeable
batteries. No other type of rechargeable battery should be used
in the radio.
) NEVER mix old and new Alkaline batteries. The old batteries may
suffer damage and leak which will damage your radio and whatever
the radio is standing on.
3) NEVER mix old and new Rechargeable batteries. This may result
in unreliable charging and shortened battery life. Never mix
Rechargeable batteries of different types or capacities even if
they are new.
4) NEVER mix Alkaline and Rechargeable batteries. The recharging
of Alkaline batteries can be very dangerous.
GB