Yes, the original LCD Steam Deck battery can be replaced, but removal is difficult.

Yes, you can replace the battery in an original LCD Steam Deck, but treat it as a model-specific repair with a difficult battery-removal stage. Owner accounts describe adhesive removal taking substantial time. That is a warning to plan carefully, not a reliable estimate for your unit.

Confirm your exact model first

Use the official repair documentation and replacement part for the LCD model and its revision. Do not use an OLED guide or assume parts and internal layouts are interchangeable. Before opening the device, check whether warranty or support service is available and read the entire repair guide so you know what the work involves.

Take battery condition seriously

If the battery is swollen, punctured, unusually hot, or otherwise damaged, stop and use a qualified repair service. Lithium-ion cells can become hazardous if bent or pierced. Do not improvise with heat or prying when the battery resists removal, and do not use a forum post as a substitute for the device-specific safety procedure.

The available owner accounts do not establish how long your repair will take, which technique is safe for your revision, or whether a particular replacement battery fits. Verify all three against current official documentation before proceeding.