need to know best rechargable battery in very cold (-30 degres celcius)

[Hugo De Lafontaine]

my think is lithium ion or lipoe4 can sombody help me..... i am using them as power bank 5v 40000ma


help me

 

[kubeek]

i think both li-ion and lifepo4 are pretty bad at low temperaturues.

 

[dknguyen]

Lead-acid is probably the most common and rugged one. There's a reason it's used in cars.