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@freemo liion for standardized size and longlasting
@wilmhit by long lasting if you mean the number of times you can recharge it then its about the same as NiCd and NiMH in that respect. Lithium metal has, however, about 2.5x or more recharge cycles.
This all assumes you only let your battery discharge to 50% at most. If you discharge to 100% Nickel Cadmium actually has the longest life span.
@freemo I always had opposite experience. I'm not a professional. I only repair my home appliances as a hobby. From my experience liion lasts the longest but this may be due to greater capacity/shallower cycle. I don't do li metal cuz I like 18650.
@wilmhit Its a bit more complicated than that. NiCd has memory the others dont (well NiMH has memory too but its much less noticeable). That means that when it doesnt fully discharge over time it appears as though it is end of life by having a much reduced capacity. In fact this is not a permanent position. The memory of a NiCd is caused by crystallization that is reversible by deep cycling it a few times.
In all liklihood you are seeing the memory effect rather than an end of life scenario.
Li-ion of course has the highest energy density, so that can sometimes make up for the fact that it has fewer cycles since you get more power per cycle.
Lithium metal comes in 18650 just like lithium ion batteries. In fact I'm charging a pack of 18650 lithium metal batteries as we speak
@freemo
Wait lithium metal comes in 18650s? Where would one find these? I have a project that I have been looking for a good way to add a battery. I have an 18650 chamber that I can use but I really have been wanting to test out a lithium metal battery. I just haven't been able to find one that isn't much too large for my project.
@wilmhit
