T15 cells are compatible wit the older controllers, T9 and T3 are not. Be aware that Hayward sells the cells (toungetwiswter!) with ethter a 1 year or a 3 year warranty and the price reflects this. From what I have seen the 3 year warranty cells are made with a bit tighter quality control but I do not have any actual information to confirm this.
IF you buy a generic replacement cell check the warranty closely. The warranty on your control unit is probably past so you do not have any concerns about voiding it by using a non Hayward replacement cell. I have no information on the generic cells or on "pool guy supply dot com"so I can't help you out on that.
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