Allocate more memory rx3715

Hi have a rx3715 with 58MB + the IPAQ file store of 100MB. I also have a SD 512 card that I keep all the TTN5 maps and various other bits.

The main memory is a bit tight, currently 'in use 26.5 (storage) and 11.8 (program) leaving me some 28 odd to play with.

I use 'Omega Battery Pack Pro' and it keeps saying 'memory low'. I have noticed that surfing the web hold up a lot of memory and doing a 'soft reset' does help freeing up some space BUT is there anything else that I can do. For example could I use some of the 'IPAQ file store' memory for some (or why not all) data/programmes ??
I am no 'brain' when it comes to computers but can most of the times get around a PC, PDA's are a bit different and most of my mates (who do know their PC's better than me) have no idea.

Any suggestions most welcome.

Surfed the web (on the PDA) last night and got into the setting where I could delete cookies and cleaned 'linked files' , followed this with a soft reset, now have a few more meg to play with.