I changed the batteries in my Boss 5300B as I always have one at a time--but within minutes of eachother. It worked for a few days, coming on slowly, not it is not working. How and where can I get it fixed to download entries.

Try cleaning the battery. The battery is coated when new. I had the same problem loosing 1/2 hr some days then
Ok others

Charge Doctor Diagnosing Some Common Charging System Problems

Yes the can go bad.
I still have 9 year old Kodak lithium batteries in good condition, nut I know sometimes my rechargeable batteries last no longer then a year. It is a shame that some camera brands only give a 90 day warranty on the batteries.
To keep your rechargeable batteries in a good condition, give them a charge at least every 3 months. Or always a day before you need the camera. Never try to use speed chargers. I still have a charger capable of charging full within 15 minutes. The barrettes are hot, and when charged that way after 10 or 20 times they are dead.
Just use the charger that came with your camera.
But if you only can shoot a few shote with your battery, buy a new battery.

Battery is not the problem.
It could be transistors, IC, elco etc. It must be checked.
This electronic parts, could be almost breakdown. At the beginning of the device is turned on, it work fine, but after a while it became hot, then the value is changed, then the circuit was not working.
Can also occur on the DC input, the diode and the elco (D006,C019,C40,C41). View image.

See the full diagram here :
Boss MT 2 Metal Zone distortion pedal schematic
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For Digital Diary Owners Manuals:
http://support.casio.com/en/manual/manuallist.php?cid=013

Did you go to home/world and press function, then press 1 for home time set, set the time and DATE and then press the set key?? That's what i did and it worked....good luck

Turn it off/on a few times within a few mins each times.U get a flashes of picture about 10 to 20 sec?Than ur LCD inverter board is dead.Tries Websites Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter board for the replacement.It usally a long PC board in shape.

http://www.aa1car.com/ hope this helps

Your "Oil Life Monitor" needs to be reset.
Turn ignition on, engine OFF.
Fully depress and release the accelerator pedal slowly 3 times within 5 seconds.
If CHANGE OIL indicator flashes, the system is resetting.
After indicator stops flashing, turn key off, then start vehicle. If light stays off, you are done. If it comes back on, repeat the entire procedure.
**Note** Oil life monitor should be reset, whenever you change your oil and filter.

I found it at this link:
http://servicemanuals.electronica.ro/manuals/casio/SF-5100_SF-5300.pdf
Good luck.