Don't get fooled by specs. A solar panel rated at 4 watts will rarely put out more than 2.5 watts in bright sunshine. That 4 watts is basically theorectical and only happens in rare situtions with extreme cold weather and a few other factors like snow cover and high reflection. Solar panels over-produce in cold temps. Long story short - a 4 watt panel is worthless for what you want. If you have a lot of sun, it could be used as a battery maintainer, not a charger.
Also, 6 volt panels are not common. Even 12 volt panels are getting a bit scarce, as 24, 48, and 72 volts become more common. You might need a controller if you buy certain panels - and with a controller - you have more loss.
Take tha 2.5 watts - and you've got less then 1/2 amp at 6 volts - which isn't much.
I live in a poor sunshine area of New York, and I have several solar battery maintainers for tractors that spend most of their lives sitting. I use 15 watt panels and they work well enough to maintain batteries that are already charged. Not to charge run down batteries.
You can buy some pretty good 15 watt panels with battery cables for $60 if you shop around.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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