I bought 2x bl-4c batteries, 1900 mAh, at €2,- a piece off ebay. Even standard official Nokia bl-4c's are a couple of euros there. Check it, postage was more expensive than the batteries for me, total was €12,- for 2 batteries delivered, from a german ebay shop.
You might want to try if a small strip of paper under the battery (small side opposite of connectors) helps keeping good contact, if bad contacts are the case. Won't help a dead battery of course.
EDIT: if you send member Uxcell a personal message here on the forum, you will get a response. Send your order number with the complaint.
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