WonderSwan v5.2: Color Only?

[Danno]

Just bought $40 worth of batteries and didn't find any that solved the problem. I've tested these, new from the package:

• Energizer (alkaline)
  
• Energizer Max (alkaline)
  
• Energizer Ultimate (lithium)
  
• Duracell (alkaline)
  
• Rayovac Fusion (alkaline)
  

Of them, the Energizer Ultimate took maybe 10~15 seconds to boot, while the others are in the 20~22 second range. So there's that, I guess.