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In my Mini UPS project for my router, I made a little circuit by using a 18650 li-ion battery charger module, a 3.7v /2800mAH li-ion battery, and the DC step-up boost converter. My router requires 9v/0.6A current. So once I connected this UPS for my router and switch it on and

schematic

simulate this circuit – Schematic created using CircuitLab

It seems quickly light up and disappear all lights in the router (Not working)

What i went wrong here? Have BMS or step-up converter a certain output power limit? Are my BMS, step-up converter, and or the battery not enough power to driving my router?

S.Macualiff
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  • You haven't shown details of your step-up converter. – Andy aka Jan 13 '21 at 12:29
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    As Andy comments, we need **details**. Maybe you're using an unsuitable step-up converter. Maybe the battery is no good. Maybe... You can do basic trouble shooting, it is OK to, **as a test**, connect the battery directly to the boost converter. Does that work => then the BMS might not be OK. Does that also not work => battery and/or boost converter are not OK. – Bimpelrekkie Jan 13 '21 at 12:32
  • Yes they are limited in power, and 0.6A at 9V will need about 2A at 3.7V. The datasheets for those components will tell you those limits. –  Jan 13 '21 at 13:45
  • Thanks all for your support. I'll consider things that you tell – S.Macualiff Jan 13 '21 at 14:40
  • @Andyaka. I also don't know what is the specifications of my step-up converter. Cause I have a very little knowledge about electronics. I just go to the shop and bought it. How I find the details of the step-up converter. It seems there is no model number. – S.Macualiff Jan 13 '21 at 14:47
  • @Bimpelrekkie I'll see – S.Macualiff Jan 13 '21 at 14:48
  • [What to check for when buying an electronic component or module](https://electronics.stackexchange.com/questions/504044/what-to-check-for-when-buying-an-electronic-component-or-module). – Andy aka Jan 13 '21 at 15:03

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