Powerbank that doesn't turn off when device charged?

stator

Does anyone know of a cheapish USB powerbank that can be used to continuosly charge a device?
I have a mobile phone being used as a webcam, it's powered by a powerbank but when the phone reaches 100% the powerbank turns off the juice and the phone discharges within 1hr. I guess it detects the drop in current being drawn and turns itself off to save power. But the powerbank still has more than 70% charge remaining so if I unplug the USB cable and plug it back in it starts charging the phone again.
If I leave the phone plugged in to a mains USB adapter it keeps drawing from the mains after 100% charge is reached, but this isn't practical for it's location.

So what I'm after is a powerbank that can be used even once the device is charged. The banks I use at the moment are 10ah but it doesn't need to be that big.

Anyone know of any?

grumpycrab

Use a mains charger with extension(s) as necessary.

stator

Not possible

agrinnall

If you can't find a powerbank that will do what you want could you install some sort of timed switch between the powerbank and the phone that would cut the supply on a regular interval (less than the time of the auto cut off that happens now) to replicate what you do manually?

alanwsg

Aha - I had the exact same problem.

I ended up making a custom USB cable that has a 330R resistor across it so that even when the mobile stopped charging there was still a 15mA current draw on the battery pack.

forgotmyname

Its the phone saying i dont need anymore charge and cutting the powerbank off.

Powerbank no longer detects any current draw so goes to sleep.

Fit a dummy load to always draw just enough power to keep the powerbank active. But that will drain the battery quicker.

stator

No, if that were the case it would do the same thing on a mains charger. I believe it is the current drop which causes the powerbank to cut off supply.

Feral_Moon

Just wish I could find one which will charge up my iPad. It completely charges the iPhone, no problem, but if I plug in the iPad it runs out of power and switches off after about 20% worth of charge. Anyone know why?

Benners123

All the powerbanks I own don't switch off and continuously charge.

https://www.amazon.co.uk/EasyAcc-10000mAh-Brilliant-Smartphone-Bluetooth/dp/B00H9BEC8E

this doesn't switch off, I think! Hope that helps.

stator

Benners123 wrote: »

All the powerbanks I own don't switch off and continuously charge.

https://www.amazon.co.uk/EasyAcc-10000mAh-Brilliant-Smartphone-Bluetooth/dp/B00H9BEC8E

this doesn't switch off, I think! Hope that helps.

Thanks
Little concerned that some of the reviews say it melted :eek:

pappa_golf

stator wrote: »

Thanks
Little concerned that some of the reviews say it melted :eek:

yup but only once