When battery holder is exposed in wet environment, the battery spring is easy to rust.

Keyu brand 8 X Aa Battery Holder Box with PH2.0-2P heads is usually used for products which need power supplies 6V with 8 AA batteries and PH2.0-2P heads.

Compression with battery holder negative electrode: We should make sure the batteries can not be thrown out when battery is loaded, even if there is no battery cover for battery holder.

Keyu brand 4 AA battery holder with lead wires and SM-2Y head is usually used for products which need power supply 6V with 4 AA batteries and SM-2Y head.

Keyu brand 2 AAA Battery holder with PC pins is usually used for customized products which need power supplies 3V with two AAA battery and PC pins terminals.

In fact these are some materials suited for your contacts of button cell battery holder: 1. stainless steel. 2.brass. 3.phosphorus bronze.