PRIMARY BATTERIES 



Cylindrical 



dry 



Leclanche 



Layer- dry 

 Leclanche 



Mai lory 



Silver-zinc 



Ni-Fe 



Lead-acid 



0-1 



i 6 8 1 2 



Energy delivered per unit weight 



6 8 10 

 Wh/oz 



Figure 19.2 



Primary ceils; replacement cost per unit energy 

 Cylindrical 



dry 



Leclanche 

 (100 h rate) 



Layer-dry, 

 Leclanche 

 (100 h rate) 



Mallory 



U2 Flag UIO 



D21 



155 



135 



132 



112 



RM12 RMl 



TR112 



Secondary cells;capital cost per unit energy 

 Silver- zinc - 



Ni-Fe 



Lead-acid 

 ( 20 h rate) 



1 



H200 H15 



Z551 2101 



C B 



J L 



_LL 



J I \ I I M I 



H075 



J \ \ I I I M 



A 6 8 10 2 -i 6 8 100 2 



Cost per unit energy (pence per Wh) 



Figure 19.3 



6 81000 



287 



