My Philips 9FF2 photo frame no longer holds a battery charge. How do I replace the rechargeable battery?

Look in the manual

The maximum size of an SD card is 2GB, and the 9FF2 will support SD cards of that size. The 9FF2 will not support SDHC cards, which start at 4GB and go up.

Hello,
the Philips 9FF2 photo frame has an internal rechargeable battery inside the photo frame. So in other words, the Philips 9FF2 photo frame needs to be disassembled for you to be able to access the battery, then make necessary replacement.
With the Philips 9FF2 photo frame turned off and remove from the charger, get a screw driver, use it to disassemble the unit to take the back cover apart in order to gain access to the internal part to get to the battery.
Remove the battery, take it to any electronics part store in your area and get a battery replacement. It is not necessary that you get a Philips battery, all you need is a battery with the same size and volt/watt.
I hope the above is clear.
Regards.

You need to replace your rechargeable batteries. Rechargeable batteries have shelf life too depending on usage. Get the model number off your existing battery, google it and you should be able to find some retailer that sells something compatible.

I have the same issue with mine. It is the rechargeable battery that is expanding. It looks a pretty unsafe to me, so I've unplugged it. The issue appears to have been reported here:
http://www.saferproducts.gov/ViewIncident/1389002

A new LCD screen can coud about 15 to 20 USD (eBay).
Then see this tutorial: http://www.youtube.com/watch?v=u-5eDINc35s

Good luck

Solution: As digital cameras become more advanced and include more features, the power needed to keep them functioning has also increased. That means that typical alkaline batteries likely won’t do more than power your camera for a few shots before running out of juice. Sometimes, your digital camera may not power on at all if the inserted alkaline batteries aren’t fully charged or powerful enough. Rather than carry along dozens of alkaline batteries for a single photo shoot, you can save money by purchasing rechargeable NiMH (nickel-metal hydride) batteries. Rechargeable batteries can be purchased with a charger that you plug into a wall outlet, and they fully charge in one to five hours depending on the charger and the type of batteries you’re using.

If you’re already using rechargeable batteries but are experiencing short battery life with your digital camera, it’s likely time to replace your rechargeable batteries with new ones. Depending on the number of charging cycles you perform (how many times you discharge and recharge your batteries), rechargeable batteries typically last for two to three years before they no longer hold a full charge. You may also ensure that you’re charging your rechargeable batteries directly before use. As batteries sit unused for extended periods of time, they automatically lose some of their charge.

There are many ways you can conserve battery life while using your digital camera, too. For starters, if your camera has a viewfinder in addition to an LCD, use the viewfinder to frame your shots and turn the LCD off because LCDs draw a lot of power. If you prefer to use the LCD, you can still conserve battery life if you refrain from looking at each picture on the screen after you take it.

I contacted Philips directly

It seems that SD cards bigger than 2 GB are not supported by this photo frame... I have the same problem tsssss...