This problem is more complicated. Do we need to consider battery size? For example, in option 2, the 18500 battery cannot be put in battery compartment no. 7...
I use my cell phone to access the Internet, which does not 'is not practical, I will analyze it in. detail for you in the evening...
Analysis of each solution:
1) The capacity of a 14500 lithium battery is less than 1000 mAh, while the nickel- high-capacity metal hydride The battery can reach 2500 mAh, and the capacity of the long-life battery can also reach 2000 mAh, so in terms of battery life, it must be nickel-metal hydride. There are advantages.
2) The maximum capacity of three AA nickel-metal hydride batteries is only 1000 mAh, while the capacity of 18500 lithium battery can reach more than 1500 mAh, it must therefore be a lithium battery.
3) It's the samethan the first, and the advantages of nickel metal hydride are more obvious.
4) The capacity of 25500 lithium battery is about 3000 mAh, while the capacity of nickel-metal hydride battery can reach 4000 mAh, so the capacity of nickel-metal hydride battery metal hydride is also higher.
The analysis above shows:
Options 1, 3 and 4 all call for using lithium batteries as well as empty batteries to replace the nickel batteries - metal hydride. existence of empty batteries, this solution will significantly reduce the capacity-to-volume ratio of lithium batteries, so that the final energy supplied will be lower than that of nickel-metal hydride batteries. In this case, nickel-metal hydride batteries usually can. be used to achieve higher capabilities.
The second plan is to use 18,500 batteries to replace the three nick batteriesel-metal hydride as well as the support. The actual volume of battery cells is not significantly reduced, so the advantages of lithium batteries are highlighted.
As for your question about whether to use a protection board, since your lithium battery needs to be removed and charged separately, the charging protection function of the protection board is not not necessary. But generally speaking, flashlights don't have a cutoff voltage when discharging (brightness is significantly reduced at low voltage, but discharging continues. This was the case in the past. I don't haven't noticed the new flashlights now). In this case, if there is no protection board, lithium batteries will suffer excessive discharge during the discharge process. Here the discharge protection function of the protection board is necessary. In addition, the internal space of theflashlight in this solution is relatively sufficient. the protection panel must be able to be placed.
The above is just my personal opinion. Hope this can be helpful to you, thanks!