IF YOU ARE USING THESE NI-CAD BATTERIES FOR ELECTRONICS AND TOYS MAKE SURE YOU ARE USING THE CORRECT CHARGER THAT WILL CHARGE NI-CAD BATTERIES. 

NOT ALL CHARGERS ARE THE SAME AND WILL NOT CHARGE THE DIFFERENT TYPES OF METALS IN THE DIFFERENT TYPES OF BATTERIES.

SOME CHARGERS WILL CUT OFF CHARGING AT CERTAIN TEMPERATURES FOR CERTAIN METALS AND WONT CHARGE THE NI-CAD FULLY. 

IF THE CHARGER SAYS IT WILL CHARGE NI-CAD THEN YOU ARE GOOD.

****** NOT ALL RECHARGEABLE BATTERIES WILL WORK IN YOUR SOLAR LIGHTS.******

IF THE MAH IS TO HIGH THEY WONT CHARGE FULLY. MOST SOLAR LIGHTS ARE 300 - 1000 MAH. 

THE MAH IS THE STORAGE CAPACITY OF THE BATTERY. THE HIGHER THE MAH THE LONGER IT TAKES TO CHARGE THE BATTERY WITH DIRECT SUNLIGHT.

IT IS BEST TO REPLACE WITH THE SAME SIZE THAT WAS IN THEM OR CLOSE TO IT.

IF YOU THINK GETTING  A LARGER MAH BATTERY WILL WORK BETTER, THAT IS INCORRECT WHEN IT COMES TO SOLAR LIGHTS. THEY ARE DESIGNED FOR A SPECIFIC BATTERY.