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Questions batterys lithium

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tiago1986:
I am in doubt if these two BM20 and BP-5L batteries are lithium or lithium polymer batteries or lithium ions

the BP-5L batteries are 1800mah and the BM20 battery is 2000 I charged them using this photo charger for 75% after how many days do I need to recharge them again so they have long storage and durability?

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTXi58e_qNfzMCh8Kjr8ghv_fioU1COM08HvA&usqp=CAU
https://cf.shopee.com.br/file/247c2106d63885dc17be99b61824b8f1
https://www.dhresource.com/0x0/f2/albu/g8/M00/89/F0/rBVaVFzuMVGACHY8AAHs3FpwpDE386.jpg/universal-cellphone-battery-lcd-charger-single.jpg
https://www.dhresource.com/0x0/f2/albu/g4/M01/99/29/rBVaEFdqVmqAN_XSAAIMWAUWzYk355.jpg/mobile-universal-battery-charger-usb-port.jpg

tiago1986:
Please help

ejeffrey:
Those are lithium polymer cells.  The chemistry is basically the same but standard lithium ion are usually metal cylindrical cells while flat/rectangular cells are almost always lithium polymer.  Technically it doesn't have to be, you can make a polymer electrolyte cell rolled in a cylinder or a liquid electrolyte in a prismatic cell but it is very uncommon.

Regardless, self discharge depends on temperature, battery condition, and age, but takes about a year.  Topping them up every few months should be enough to keep them healthy.

tiago1986:
I have xiaomi BM20 2000mah 4.2v and Chinese BP-5L 1800mah 3.7v batteries and I recharged it to 75% and stored it using this photo charger and I need to know how much I will recharge again to preserve battery life
temperature my home varies 31-34ºC

https://pt.aliexpress.com/item/32581647988.html

ejeffrey:
It's not super sensitive, probably storing anywhere from 40-85% will avoid unnecessary damage.  Really if you that concerned about battery longevity you probably shouldn't be buying the cheapest batteries and chargers from aliexpress.

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