solar powered yard lights etc.

[z]

any reason not to replace the rechargable batteries they come with
with something with more capacity, when the batteries die?

 

[Tom Biasi]

any reason not to replace the rechargable batteries they come with
with something with more capacity, when the batteries die?

The only problem you may have is the ability of the system to charge the
higher capacity cells.
Keep the chemistry the same, ie if it has NiCads don't put in NiMH.

Tom

 

[Eeyore]

any reason not to replace the rechargable batteries they come with
with something with more capacity, when the batteries die?

Solar power produces VERY little electricity.

Graham