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MORE DRILLS and cordless kits feature lighter or longer-running lithium-ion cells instead of nickel-cadmium. But our tests show that lithium cells can die an early death if you aren't careful.
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Several lithium batteries from multiple brands couldn't be recharged after we ran them down to full discharge. So using every last minute of run time is a potentially expensive mistake, since replacement cells can cost more than $100. You can also shorten batteries' life span if you let them sit longer than six months with a full charge, manufacturers say. Both situations make built-in charge indicators a plus for lithium batteries. But among ...