No replacement Batteries for Solar Flair lights

I bought a year ago a solar spot light - solar flair 28LED ********** 875764 - was so happy with it bought no 2 - now no1 battery 18 ********** mah 3.7V with 2 wires pop out of casing - is flat - go to the stores just to be told they spoke to buyers and because batteries didnt sell they not gone bring in again - so this means i paid R900 a piece- and now must buy a new one - no ways - Builders had the batteries but they had Soso Lights and that batteries didnt fix in that lights - so now again new solar light no batteries - can someone get me it!!! Im not gone buy new light i need Builders to bring to store which sell still this lights batteries!