I am interested in the Lithium battery replacements. 600CCA vs 400 and feather light.
This is an interesting video. Scroll through to the 2:37 mark to avoid the garbage.
LI has higher power densities, no doubt about it, but they are not all peaches and cream in other areas of starting battery performance. Not bashing them, just reminding people to research the complete story before assuming all those folks promoting them as better than sex are right. LI has a problem with low temperatures for one thing (take your LI powered drill outside this winter and screw in some long deck screws or lag bolts). LI also have a totally different voltage curve that can mislead you into thinking you still have a full charge. Voltage remains about the same during usage until it falls off the cliff at the end. The protective circuitry has to shut the battery down when it reaches a certain percentage of charge, if you let the battery become fully discharged you may not be able to recharge it. Btw, that's why your cell phone shuts down when it's battery reaches a preset low limit. And let's never forget that people still have fires with devices that use LI batteries, even after all the years of knowing about the dangers and supposedly designing better controller circuitry to prevent runaway reactions.
I'm waiting for the next generation of batteries that will kick the LI and the lead-acid versions to the curb. It may be sooner than we think, now that more and more companies and consumers are embracing electric cars.
JMHO - Jerry