I just bought a power bank pcb for a diy project I'm planning. The PCB requires a lithium ion battery with 3.7 volts as input. The power bank then outputs 5v to 2 other PCBs. Can I use any Li-ion battery that meets this requirement? More specifically, can I use a Nintendo 3DS battery (which meets the requirement).

The other PCBs are a Bluetooth receiver and an amp if that matters.



Power bank: https://www.banggood.com/Dual-USB-5V-1A-2_1A-Mobile-Power-Bank-18650-Battery-Charger-PCB-Module-Board-p-1031593.html?cur_warehouse=CN

Bluetooth pcb: https://www.banggood.com/Stereo-Audio-Amplifier-Module-Wireless-Bluetooth-Receiver-USB-Power-Support-TF-AUX-p-1100590.html

Battery: https://www.banggood.com/Wholesale-2000mAh-3_7V-Rechargeable-Battery-Pack-for-Nintendo-3DS-p-39495.html

Amp: https://www.bidorbuy.co.za/item/333899725/PAM8403_5V_2_Channel_3W_Mini_Digital_Power_Amplifier_Module_Board_For_Arduino_LOCAL_STOCK.html


closed as off-topic by Dmitry Grigoryev, pipe, Michel Keijzers, Finbarr, RoyC Apr 19 '18 at 8:47

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions on the use of electronic devices are off-topic as this site is intended specifically for questions on electronics design." – Dmitry Grigoryev, pipe, Michel Keijzers, Finbarr, RoyC
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  • 1
    \$\begingroup\$ If it meets the requirement, it meets the requirement. Just don't forget to check if you battery can also deliver the current your circuit will try to draw from it. \$\endgroup\$ – DonFusili Apr 17 '18 at 8:02
  • 1
    \$\begingroup\$ It powers a Nintendo 3DS, I'm assuming that contains a PCB. \$\endgroup\$ – Colin Apr 17 '18 at 8:24
  • \$\begingroup\$ Does the power bank pcb (you should have put a link to it in the question) have protection for the battery so that it can't be excessively discharged? Or does a Nintendo 3DS battery have that protection built into it? \$\endgroup\$ – Andrew Morton Apr 17 '18 at 10:16
  • \$\begingroup\$ Possible duplicate of Can a cell phone battery be used in a power bank at 2A? \$\endgroup\$ – MCG Apr 17 '18 at 13:08

You probably bought a boost converter or something similar, a boost converter takes a small input voltage in your case 3.7V and gives a larger output voltage in your case 5V.

A boost converter achieves the higher output voltage by sacrificing current. It will draw much more current from the battery at 3.7V than it can deliver at 5V.

You must make sure the battery can deliver the required current.

Trying to draw more current than the battery is rated for can damage the battery and with a lithium battery, damage can start a fire.

A boost converter is a type of switched mode power supply and as with all switched mode supplies it will be very noisy - so make sure you filter it properly (there will probably be guidance in the datasheet).


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