Are my batteries charged all the time when connected to my Player/Recorder?

Will keeping my charger connected a long time damage my batteries? Can I
leave it over night?

Does Rockbox charge the batteries more/less/worse/better than the Archos
firmware?

What kind of batteries are there in my factory default Player/Recorder?

Is it hard to change the batteries? Does it void my warranty?

How much cost replacement batteries? Where can I buy them?

What kind of run-time can I expect on a set of fully-charged batteries
when running Rockbox?

Can I use different batteries in my Archos?

Can I use non-charable batteries in my Archos?

Can I use a different charger?

Can I buy a replacement charger exactly as the one Archos shipped?