I have a canon UC 900 Cancorder. It was bought around about 1990, but since my husband has died I have not used it. I have been trying to charge up the battery, but probably need a new one. I also need to know what type of lithium battery is needed. The cassette holder works fine when nothing is in it, but now I have a cassette stuck in it and nothing seems to work. I would be grateful if you could give me some advice. Thanks Sheila Stewart