Bought a used G3 about 3 weeks ago. Needed a new battery as spare so ordered a Duracell direct from Amazon (not third party). It's faulty. If I put it in charger, the green light starts flashing. Manual says either clean contacts, or temperature is too high or low, which it isn't. Been on charge for 2 hours, but no increase in the single bar showing. Original Panasonic battery charging Ok so not faulty charger. Is there compatibility issue with these Duracell replacements? I thought Amazon didn't sell fakes. I have said I'm returning it. I'd hate the replacement to do the same. Advice appreciated.