I was wondering if anyone has bought these cheap camcorder batteries for the JVC GR-D290 which can be found here: BN-VF733 Batteries on eBay These batteries are priced at around £14.00 which is much cheaper than the £95 that jvc.co.uk will charge you. I was thinking of getting one as a backup battery and charging it using an external charger. 1. Do they last for about 5-7 hours (3300mah)? as they aren't JVC brand. 2. Are they recognised as JVC data batteries by the camcorder? ie. is the data correct about how much battery charge left? I know someone's going to say "you get what you pay for" but these batteries seem to be identical to the ones being sold by camcorder battery suppliers for about £50. Not JVC brand eg. Akku brand So my guess is that these suppliers must get these same batteries for around the same price. The descriptions of these batteries often state "100% compatible" but does this include compatibility with the "Data Battery" function.