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most of us dive the petrels with regular old AA batteries. Changing them every 20-25 hours of use is a nonissue and since a lot of the backup lights these days take 3 AA's, it is a convenient use for the fourth one...
Definitely go DG03 over the Uwatec if you decide to stay in the lower end of the price spectrum, the fact that is has a gauge mode on top of being a multi gas computer just makes it that much more useful. You can run it as a true spare dive computer, or leave it in gauge mode, but it is also something that you can take with you if you go travel some place and don't want to take your petrel or other more expensive for whatever reason. My Nitek duo runs that duty
Definitely go DG03 over the Uwatec if you decide to stay in the lower end of the price spectrum, the fact that is has a gauge mode on top of being a multi gas computer just makes it that much more useful. You can run it as a true spare dive computer, or leave it in gauge mode, but it is also something that you can take with you if you go travel some place and don't want to take your petrel or other more expensive for whatever reason. My Nitek duo runs that duty