I don't know your model number, but the manual for the PD4500 model has the following statement concerning battery or not.
The INTELI-POWER series of converters are primarily designed for use with a battery, however, the output of the INTELI-POWER converters are a regulated, filtered DC voltage that can power sensitive electronics without the need for a battery or other filtering.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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