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Although your watch is solar-power all Eco-Drive watches contain a rechargeable battery known as a capacitor. They last longer than a regular battery but are difficult to get replaced because nobody carries them. Firstly I assure you whoever opened the watch did damage it. The solar sell is under the dial so removing the back would not have exposed it to anything. Rechargeable batteries do not hold a charge forever and do need to be replaced every 5-10 years. In order to know which capacitor you need you need to find out what movement model is in the watch (this is different than the model number of the watch you must physically look at the movement) (unlike batteries capacitors all have the same number on the cell so you need to know the movement number to order the proper size). Once you have obtained the capacitor repairing your watch because no more difficult then changing a battery. I'd ask those people to take the back off again so you can find out what movement is in the watch. Typically it's a 4 digit number but sometimes it also has letters in front of it and I've also seen them with only 3 digits. If you could supply me with the movement number I can supply you with a the proper capacitor at a price of $45 with free shipping and tracking.
Some watches have a "reset" button or combination of buttons that must be pushed to clear all the electronic registries on the watch's little computer after you replace the battery. You might try taking off the watch back and seeing if your watch has this requirement. Even then, it's not always a perfect solution. Last week, I replaced the battery in a watch that had been dead for some time. The watch appeared to come alive again when I put the new battery in, but when I pushed the reset pin (on this movement, it was on the watch movement itself, next to the battery), the entire watch went dead. Nothing I did would wake it up. I removed the battery, waited 30 seconds, then re-inserted the battery. Problem solved; the watch powered up, and I was able to set the time and access all functions again.
On some digital watches from the 1980s, after replacing the batteries, you were supposed to push and hold all the external buttons for a few seconds to reset the watch. I don't think manufacturers still make watches that respond to this, but it is easier to try than taking off the back and re-installing the battery.
To maintain the warranty and ensure that you do not have any problems with the seals. It is recommended to send your watch in to an Authoriozed Polar Service Center. Doing anything else will void the warranty.
it is possible to change the battery yourself or have a watch repair place do it, but you or they will not have the vaccuum sealer to repressurize the seal, and any moisture that gets in there will do damage to the CPU. A little extra tip, when you send in your watch to polar there is a 3 month warranty on that service if anything goes wrong, and it happens quite frequently outside of the system, seen it many times.
I am assuming you have a lithium battery and they test good at 3. Since they can die off slowly i would replace it as it may not have enough to power your watch. These will typically need to be replaced about every two years or so.
It is not likely that there is a protective cover over the battery itself, if there is anything on it to prevent use while not owned it is a little pc of plastic holding the stem out. It is sad to say but there is no way to tell how long the watch had the current battery in it before you received it. It is common to get a new watch and have the battery die shortly after or be already dead. Go to a local jewelry store to have replaced, make sure they are able to test the old one FIRST, if the battery is dead, allow them to replace it, if the battery is fine, return the watch to Amazon.