Change battery wahl 9918c - Wahl 9916-800 Groomsman Beard Trimmer

Yes they can, but getting into them is often a challenge. You can get batteries from www.batterybuyer.com or Amazon / eBay

Videos that may help you

https://www.google.com/search?q=wahl+9865+or+9865l+hair+trimmers+replace+battery

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You connect the blades together with the plastic part the correct way through the top of the small moving blade. The plastic part becomes a guide to keep the 2 blades running straight and true. Then engage the plastic part into the motor cam shaft and the 2 tension springs at the same time and wriggle it onto the screw hole posts and fit & tighten the screws. Lubricate and you're done.

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Here: Finally charging for our multi device world Just chose one, and thats it :). Cheers

Unfortunately, those batteries are not replaceable. If you've had it less than five years, it may still be under warranty.

The battery for my trimmer is a NiCad Sub C 1.2V 1500 Mah.
Do a Google search for it.
Get one without the solder tabs for the 9876.
I got mine here and snipped the tabs off.
I hope that this helps.
I do seem to have the trimmer in the picture.
Later!
The Shadow

Turn the trimmer off. Put your thumb under the teeth of the attachment. Push Up. The attachment should snap off. Replace the beard trimmer in the slot. Hope this helps.

Most parts are available at http://www.wahl-store.com/ under "accessories" the 9918c is a "groomsman" model.