Solar Rechargeable Devices

I had a look at one of my neighbour's solar rechargeable cat scarer.  The batteries were little 600mAh and they were down to 0.1V.  I swapped with some of mine, it worked a little but not a lot.

I recharged their little batteries and swapped it back.. The solar panel does seem to work, but it is recharging in a very low voltage...  No wonder the those batteries die in winter...