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Charging a Toy 6V 4AH battery

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marciokoko

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I have this toy motorcycle that comes with a 6V 4AH battery. Its been a while and the battery lost all charge but more importantly, i lost the power adapter that charged it.

I have a few solar panels laying around and power adapters, im looking for the best way to charge it. What type of solar panel or power adapter would i need to charge it?
 

If your panels are 6v and have an output of 1a or so, then with a series diode you could connect them direct to the battery.
If they are a higher output then you'd need a solar charge regulator.
That said, if the batts are lead acid, or nicad etc and they've been lying around for months, they are probably knacked, if you dont use them they go flat, and if flat for long periods loose capacity.
If you cycle them a few times with a mains charger they might come back.
 

I only have 4 solar panels that i use for other applications, not for this toy obviously. The toy came with a wall power adapter and its gone. I just want to make the best of it without getting too complicated. I have 20W panels to my disposal.
 

With a 20w panel on a 4ah battery you will need to get a shunt regulator or you'll nuke the battery in time.

Shunt regs are easy to wire up, usually theres just the 2 wires, a series reg has 3.
 

I don't mean to keep the battery connected permanently. I just need to charge it temporarily, once a month maybe.
 

Anyone have any other ideas?

If i just leave it connected to the 20W panel for a few hours, could it work? Or would i be better off looking for a power adapter? If so, what V/A should i look for?
 

17.5volt & 1.14amps enough for ur job

now u need LM317 along with current limiting resistor,
 

i have no idea what that is? :) LM317? resistor?
 

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