Do I need a power source to keep battery charged
1287957
No - but these models have been recalled by the manufacturer - not sure I recall what the defect was, but they are in the process of replacing these with a fixed version
1384200
no you have to plug it into a power source. that's the only way it will work.
503189
It does not retain power so yes u have to keep it plugged to a power supply in order to power anything
22414
Yes, it does need a power source and comes with the cord. Probably would not work for you. It is a nice little unit though.
1316362
Yes, I keep mine plugged in so it never needs recharging...doesn't make a difference.
2085819
Yeah! So I've plugged mine in for a power source, but it takes batteries.However, it doesn't have a speaker/amp so you'd need to orchestrate a way to do that
1163810
Yes. I would recommend you use a smart charger, like a Battery-Tender, that senses when the battery is getting charged and switches to a trickle charge, to avoid overcharging.
1897484
You can buy a power supply to eliminate the need for batteries. Check the instructions or go to google for more information.
1628305
I've hooked up several on a battery that I keep charged with a solar panel. If you are using a power supply just be sure to over size it.
619047
The power source is a little circular 3V internal battery. It is included with the device. There is also a light receiver on the face of the device that I assume contributes to managing battery power.
1095216
That really should not be necessary. Mine only needs to be charged about every 10-14 days. The battery holds a charge for a long, long time.
338785
The battery is where the energy is stored. The solar panel recharges the battery. No, a battery is necessary to hold the charge.
728995
I know there is a battery backup, but I have mine plugged into an outlet. I don't know how long the battery is supposed to last, but I wouldn't recommend it as your primary source of power.
596202
Yes, you can keep connected and keep the battery charged as long as the solar panel is also installed, I use it daily to keep my batteries charged and mew so far has given excellent results
2223228
No, but you could keep it plugged in for use if you were concerned about battery life.
1704629
Require a power supply: No; Batteries: My book says "to provide back up power". Others have mentioned that the batteries don't last to long
369680
No. When it's time to recharge, you won't have any power left to turn it on. Just plug it in and it will automatically recharge. A little light comes on to show you it's charging.