Are you saying that DEL authorities confiscated your batteries on arrival into DEL (from BLR) and then on arrival into DEL from ORD?

If that's what you are saying, that's not the norm for my experiences when unescorted. For BLR-DEL, any battery confiscation would happen in BLR and not DEL. For ORD-DEL, there'd generally be no battery confiscation at all, including none in DEL.

If you are talking about BLR-Europe/Asia (i.e., not connecting in DEL), then the batteries would get confiscated in BLR and not in DEL (and in BLR that would generally be done by BLR security and only rarely at BLR departure customs). If you are talking about DEL-ORD, then yes battery confiscation may well happen at DEL security (and occassionally at DEL departure customs).

However, if DEL security is confiscating batteries on arrival from BLR or if DEL customs is confiscating batteries on arrival from ORD, that's rather unusual. Either you are importing volumes of batteries beyond that permitted or something messed up is going on (which is rather surprising given DEL customs is supposed to be under close watch as of late).

My apologies if I'm misunderstanding your responses, but I'm trying to get an understanding of where and when in DEL your batteries are being confiscated. On flights from DEL (to anywhere in India or abroad) I can understand the battery confiscation in DEL; however, on flights into DEL (from within India or from outside of India), I cannot understand why the battery confiscation in DEL.