James, I remember a headlight mod thread where I had responded to some of your queries. I remember saying I would try a DC connection on my bike and post the results. I am not sure if we are talking about that same thread.
I have not claimed am the first one to do a DC mod, if you have done it earlier, good for you :) However, the 'mod' in question is not just hooking up a battery to the headlight directly. On an old 2.5Ah battery, it would be ineffective. You either need a larger capacity battery or somehow ensure the battery system (one or more units) can supply the required current (which is 5A for a 60W filament). I chose to go with a cheaper additional battery in parallel. Also note that, using two or more dissimilar batteries in PARALLEL is safe, and should not result in any servicing issue. The problem with dissimilar batteries arises when you connect them in SERIES. Each battery will be drained of some current based on its internal resistance in accordance with KCL (Kirchoff's Current Law). But yes, both batteries will not get fully charged at the same time, but that's something we can live with. Especially in my case when the primary battery is well past its useful life and the secondary battery is a cheap one. If this set up lasts even a year, I consider it a good investment, given the fact that am able to drive a 60W bulb :) On Wed, Feb 27, 2008 at 11:04 PM, james. r <[EMAIL PROTECTED]> wrote: > Hi Kailash, > > Hope u missed my earlier mail. This mod was done in my previous P150 with > 60/55HL bulb & the same set-up has been transferred in my current P180 but > the HL is stock 35/35. Now the 9ah battery takes care of it easily but I > use > the DC input very rare. In my P150 which was a KS version I changed the > stock 2.5ah battery with a 5ah used battery sourced from my friend. I wld > suggest u in future to install a single battery with higher capacity > however > the output is going to be the same but maintenance & space problem will be > reduced. > -- Kailas Shastry. -- !! -- [Non-text portions of this message have been removed]
