This is made by my own hand
Which has been given in the picture, 4500 mAh capacity can take backup for three hours easily, besides I am only giving a six-month service warranty, but if parts are needed you have to pay only for the parts price and as far as repair is possible I will repair it Inshallah no problem will happen, for the last one year I am using one
If you want, it can be made according to your choice, any type like
* If you have a router at home you can run it
* You can run it with any 12-volt battery at home
* I will make it just the way you want
Each can be made at almost different places at the lowest cost between 200 to 500 Taka
I just gave an idea
However, the charger rate will fall separately, if you have a charger at home then you have no cost