They include less than 4% antimony by weight to avoid {TAIL ~ various poisoning effects} of {HEAD ~ antimony} on the electrochemical processes involved 
They include less than 4 % antimony by weight to avoid { TAIL ~ various poisoning effects } of { HEAD ~ antimony } on the electrochemical processes involved
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH