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Did you mean the Forerunner 205? It is most likely that the battery has died in the unit or there may be a problem with the battery charger. The internal battery in the Forerunner 205 is not user replaceable and the unit would need to go back to a Garmin repair for replacement. Please call Garmin Tech Support for assistance. 1-800-800-1020
It's not always the battery, I assumed it was and opend mine up to check it out but the battery was OK. Problem was the unit wouldn't start without pressing mode + reset followed by the power button.
I lifted the internal watch contact strips to put a better connection between the two halves but that made no difference. I found that I couldn't delete all the history and the watch had recently turned itself off on a run after giving a low battery warning => the history was corrupted and caused the watch grief.
The only way I found to delete the history was to load a v 2.80 (or earlier) version of the watch s/w (current 2.90 doesn't delete history and there is no tool to do it!) Fortunately I had a copy of v2.80 but the old version is not now on the Garmin site (that I saw). Moral of the story, don't run your battery low for two reasons, Li-ion batteries lose capacity if you run them below ~30% and also if the watch "low battery" turns off while recording it can corrupt the history and really upset the watch.
At least I now know how to open the watch and have found plenty of possible small mobile phone batteries that will fit (Samsung have a few possibilities). The ABSOLUTE max size of a replacement battery is 36mm H x 43 mm wide x 5.8 mm deep. If you go 43 mm wide you have to trim a couple of internal plastic ridges in the case.
Good luck and try starting after pressing mode + reset if it won't fire up then try and delete all the history. Also DON'T run the battery low if you want it to last, Li-ion work opposite to NiCad and NiMH which should be fully discharged before recharge. You try and keep them above 50%.
You may need to re pair the unit with the heart rate monitor.
Settings/ General/ Accessories/ Heat rate monitor. RESTART SCAN.
OR follow this link (Hope it works)
Go here and click on owners manual. Go to page 46. Adding accessories.