It's a mundane thing, but when the juice stops flowing, frustraion sets in very quickly so make sure that your PSP's battery pack is up to scratch and get yourself a back up so that you never get caught without power.

Below you will find a multitue of PSP battery packs available for sale on eBay - choose one or two and ensure that your PSP never runs out of battery power.
 

US $9.89 (0 Bid) End Date: Monday Feb-06-2012 22:50:38 PST Buy It Now for only: US $10.89 Bid now | Buy it now | Add to watch list

US $5.50 (0 Bid) End Date: Wednesday Feb-08-2012 20:33:18 PST Buy It Now for only: US $6.99 Bid now | Buy it now | Add to watch list

US $4.99 (0 Bid) End Date: Wednesday Feb-08-2012 19:51:11 PST Bid now | Add to watch list

US $4.99 (0 Bid) End Date: Monday Feb-06-2012 19:05:07 PST Bid now | Add to watch list

US $3.99 (0 Bid) End Date: Wednesday Feb-08-2012 18:35:48 PST Bid now | Add to watch list

US $4.99 (0 Bid) End Date: Wednesday Feb-08-2012 18:35:06 PST Bid now | Add to watch list

US $5.90 (0 Bid) End Date: Friday Feb-10-2012 18:28:15 PST Buy It Now for only: US $7.50 Bid now | Buy it now | Add to watch list

US $3.99 (0 Bid) End Date: Wednesday Feb-08-2012 15:37:50 PST Bid now | Add to watch list

US $5.90 (0 Bid) End Date: Friday Feb-10-2012 15:12:07 PST Buy It Now for only: US $7.50 Bid now | Buy it now | Add to watch list

US $5.50 (0 Bid) End Date: Wednesday Feb-08-2012 15:06:10 PST Buy It Now for only: US $6.99 Bid now | Buy it now | Add to watch list