I could use them as is, as the bulbs will take any voltage between 1.5 and 9 volt. BUT for the summer in particular the lower amp NiMH will last longer (2nd or 3rd generation) as they don't or viturally don't self discharge. I have them in my back up front light and they always have about 1.5 hours charge in them even if I haven't used them for 3 months.
Not bad,I did use NiMh for many years before using these.Actually the 18650's have a protection circuit and must cut out as somewhere like 3v-3.2v.I think,has never happened to me.
There are 3 functions for the protection circuit.
1) Overcharge protection 2) Over discharge protection 3) Short circuit protection.
So what is the difference between 2nd generation and 3rd generation?
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