"Maintenance free" batteries now in use in place of common batteries have
"Maintenance free" batteries now in use in place of common batteries have
Electrode made of lead-lead oxide
Electrodes made of calcium-containing lead alloy
Non aqueous solvents as medium
Platinum electrodes
Solution
Calcium-tin-lead alloys are used for making grids for maintenance-free batteries. The calcium content in such alloys for positive grids has varied generally from about $0.06$ to about $0.1 \%$ by weight of the alloy while the tin has generally ranged from about $0.1$ up to $0.8 \%$ and even more. More typically, the calcium content in such alloys when used for making maintenance-free battery grids has been at least about $0.08 \%$ by weight or more.
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