Forklift batteries can weigh from 1,000 to 4,000 pounds. Hoists are needed to switch them in and out. Alleging that a forklift battery fell on his foot when brackets broke on a “battery lifting beam” manufactured by Battery Handling Systems Inc., Kevin Cameron — an employee of a temp agency (Callos Resources) who had been assigned to work at Comprehensive Logistics Co. — sued the manufacturer for negligence, strict liability and breach of the implied warranty of merchantability. Attacking the …