A Core deposit is a form of deposit you pay until returning your old part. If you don't have the core at the time of purchase, you must pay the core charge. That charge is refunded to you when you return the core.
Inter-cell welds reduce resistance for improved cold crank performance. Optimized grid design maximizes current flow and cranking performance. Premium alloy grid helps maximize battery life in high heat environments. Envelope separators help protect plates from direct shorts, improving service life.