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I've recently made myself a 12v to 7.4v battery conversion for my Canon 1000D DSLR Camera. This allows you to power it using a 12v source such as a Skywatcher Powertank/Leisure battery, and ensures there's no need for battery swaps mid-imaging run. If you buy a pre-made one then these are ~£40 from Astronomiser etc.Parts, Tools and Instructions are detailed below.Note: I've put Maplin codes, links and prices for some of the parts for reference, but they can probably be obtained elsewhere cheaper. e.g. eBay, Farnell, RS Components etc.Note 2: This is a guide only and I take no responsibility for people breaking their camera!Parts List:Velleman K1823 1A PSU (Maplin VE58N) £9.99Plastic Enclosure 75x51x25 (Maplin KC92A) £2.9912v Switch (Maplin N84JZ) £1.993mm 12v Red LED (Maplin CJ66W) £0.743mm LED holder (Maplin N85AX) £1.3420mm fuseholder (Maplin CT90X) £1.0520mm fuse 1A (Maplin GJ90X) £0.21TO220 Heatsink (Maplin KU50E) £1.14Canon 1000D LP-E5 Battery (eBay) £2.1912v Cigarette Lighter Plug & Lead (eBay) £2.75Wire ~£0Zip ties ~£0TOTAL: £24.39Tools:Soldering ironSolderGlue gunDrillStanley knifeWirecuttersSmall philips screwdriverMultimeterInstructions:Open K1823 kit and complete using enclosed instructions, apart from lying the large capacitor down on its side - so it fits into the case.Place heatsink onto TM317, will have to bend the component back slightly so it fits in the case.Drill one hole in either end of the plastic enclosure for wires in & out.Make holes in enclosure lid for led holder, fuse holder and switch.Fit items into lid.Cut end off cig plug.Measure & cut wires, solder up according to wiring diagram.Carefully open LP-E5 battery case & remove battery, but retain contacts. (Can cut down small pcb just to leave contacts, if easier)Make a small hole in the battery case for wire to come out of.Solder up output wires from K1823 to contacts inside battery case.Check everything including all soldered joints.Insert fuse into fuse holder.Insert cig plug into a 12v source (e.g. Powertank).Use multimeter to check output voltage.Adjust potentiometer on K1823 board to get correct 7.4v.Switch everything off.Glue K1823 board into enclosure.Fit tie-wraps both sides of wires coming out of enclosure for strain relief.Glue battery case back together.Switch everything back on & re-check output voltage.Screw lid onto enclosure.If ok, then insert battery into camera and turn on.