Connecting the panels across the batteries via a Schottky diode is
safe enough in most cases. Your cells  are low capacity, which
typically tolerate a large % of trickle charge compared to large
capacity cells. PV panel charge ability will be
low.```````````````````````````````````````````````````````````````````````=
`````

The charging voltage is OK.
About 1.45V/cell is fully charged when measured while charging.

Largely indirect sunlight through glass will provide only a small % of
max charge rate. Direct sun is needed for max charge. Clean window
glass will reduce charge rate by 10%-20%.



     Russell
--=20
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