USB powered "fake" battery pack adapter?

[HP-Collection]

(04-14-2018 09:58 PM)Paul Berger (Canada) Wrote:  

(04-14-2018 06:13 PM)HP-Collection Wrote:  You you talking on HP41 battery packs or on which pack you are talking?
I use LiPo packs for my HP41 and for my topcat serie..... High power, linear power, easy to recharge

What do you use as a voltage booster in your LiPo pack for you topcat? I have been playing around with the so called "Power Bank" devices. There are some that automatically turn on when a load is applied and turn themselves off when the load goes away. I have one connected to my 97 right now and it works great. This one has two 18650 cells and it would be a pretty tight fit to jam the two cells and the electronics into a battery pack. The only down side of these I can see is that when they run down they will stop without warning.

I found a DC-DC Step Up Power Supply Module Boost 2-5V to 5V (1200mA). The original cell has 4.8V, so 5V is perfect. Only the card reader is a silly thing as the LiPo booster has problems when the battery gets lower.
You can find thisese boosters on TOS or on Ali