Donnie,Donnie wrote:If using varitronic and battery remember that the battery is only ever getting a trickle charge. I had similar up to about a year ago using a standard vespa battery.
While some of the already mentioned batteries may do what you want the linked ones are 7Ah and 4.5Ah only, standard Vespa PX battery is 9! ..........
PS, I now run a wassell 12v dc setup with the vespa battery which happily copes with the headlight as well as the spotlight.
The circumstances you describe seem more attributable to the Varitronic stator than the battery. First, the Varitronic has poor power output for lighting, so it struggles to charge a battery AND run the lights. In fact, many struggle to run the lights, and would therefore drain the battery as well.
Secondly, the 9Ah battery on the Vespa has to be big because it is needed to start the engine. Few Lambrettas have electric start, so a big battery is not required (hence my previous post).
Finally, the Wassell DC set-up has solved your problem because it has a decent power output: the battery has little to do with the performance of the lighting circuit but remains a useful reservoir of power and a great stabilising element of the power circuit.
