Scenario: I want to be able to charge a set of Philips LFH-9354 batteries so I can have a spare set.
Question: Is there a standalone Philips charger for the LFH-9154 batteries?
The LFH-9154 batteries are of a special “intelligent” design that allows for quicker charge times and longer battery usage between charging. The DPM and SpeechMikes include special charging circuitry for that very reason, which why you cannot charge any other brand of batteries in our units.
I suggest purchasing universal rechargeable batteries (with a charger) and use those.  The DPM & SM will work just fine with third-party rechargeable batteries.
Verification Source: Philips Technical Support Team & In-house testing.