Does not hold a charge. Batteries may be dead.

I think that your batteries may have expired due to old age and are refusing to hold a charge.

Ni cad batteries have a shelf life and once that time limit has expired, you need to replace the batteries with new ones which will begin counting down to their expire date and also go dead.
once ni cad batteries have expired and past their time limit
nothing can be done to revive them ,they are forevermore dead and must be replaced.

that is the reason why i buy 120 volt ac drills instead of battery powered drills which are always dead by the time i need to use them and wont hold a charge when i try to recharge them.

my cordless radio phone batteries go dead after 1 hour on the phone, when they were newer,i could talk for 4 hours and still have 1/4 charge left. soon they will only last 30 minutes and need a 12 hour recharge to come back to 4 bars.
so i expect to have to pay 4 new batteries by christmas.

One other option may be that your charger is not working properly and developing the required voltage.
that also happens but not as often as dead batteries that wont hold a charge.
if you have a radio shack nearby, even if its a 20 mile drive
they can test your batteries and also test your battery charger. just ask for a salesman that has a battery tester and a vom [volt,ohm,milli amp meter] also called a multi meter. The vom will test your charger and came also test your batteries, but most salesmen dont know enough about the vom to use it as a battery tester .

PS a battery tester is just a vom scaled down for battery testing only, made easy to use for dummies.

i think the battery might be cooked

Did you fully charge both batteries before using them the first time? If not then they may not be able to hold a charge. It sounds to me like the batteries are either dead or defective as obviously the saw now doesn't have the juice to cut the board. If it's still under warranty take it back and get a replacement. Also, how powerful are the batteries? Even an 18V saw will struggle sometimes cutting a 2x4, they just don't have that much power. The plywood is easier to cut obviously.

The Polaroid are good batteries, but! by your description they need to be replaced because it won't hold a full charge.

Your batteries no longer hold charge as deeply as they once were capable. Typical symptom of rechargeable batteries. You need to replace them.

If the old batteries were corroded, that may have damaged the circuit board. If the batteries were getting hot before the shaver died, the heat may also have damaged the circuit board. It is also very possible that the salesperson did not do a good job installing them as they are not trained in replacing batteries in shavers.
For expert shaver battery installation, you can contact shaveroutlet.com

ron, if your batteries have ever gone dead or amps has gotten below norm, then the batteries will never hold a charge again. replace batteries.

the battery's are most likely dead, (like the real dead) after many uses of rechargeable battery's they slow stop holding charge at all, make sure when you get a new rechargeable battery you fully charge it once and fully discharge it once this will increase batterys life time

if you are using "AA" size, do NOT use typical alkalines in your camera, they die too fast. Buy rechargable NiMH batteries and a charger at Walmart or somewhere. These will hold a charge longer for you. Also be sure to turn off teh camera when not shooting because the camera is always draining battery life when "on."

Your handset or charger has gone bad (provided you installed rechargable batteries), or both. The previous user may have installed alkaline batteries (is their a white powdery residue in the the charge compartment?), and that can ruin the charge circuit. Either way, you probably need to contact repair. You can go to www.cordlessrepair.com