As Christmas was on a budget this year, one of the presents I came up with consisted of a fishbowl with battery operated (flat CR2032 3V) tea-light candles in the bottom, these were covered in coloured glass beads and then I put air plants in the bowl mounted on driftwood. The effect is really nice (i.e. the flickering light under the beads).
However, it is not practical to keep lifting out the plants/driftwood, emptying all the beads, and swapping the batteries in every candle every few days or so.
Therefore, I thought about sticking the candles to a cardboard base, soldering thin wires to all the negatives and to all the positives of the candles (i.e. leaving the small battery cover off each one), running the cables to the back of the bowl and attaching some form of 'battery' holder that will site above the beads so it will be easy to plug in new batteries when needed.
My initial thought (as there are 12 candles and they all require 3V CR2032 batteries) is to connect them in 3 banks of three batteries and use a square 9V battery for each.
My question is (as I have no experience of this at all) will this work or am I simplifying this too much (i.e. will the 9V battery give the same 'power' output and drive the candles or will it damage them, does the length of wire have an effect at such a short distance, do I need to measure the resistance of each candle and do some calculation based on that?).
Apologies for the long-winded question but I just wanted to give someone as much info as possible.