Upgrading DIY PowerBank for Smartphones & Other USB Compliant Device

This is an upgraded DIY Powerbank projects for:

•DIY 1-Home made Powerbank using AA Batteries

•Links found here:

iPhone DIY Powerbank

https://www.instructables.com/id/iPhone-DIY-PowerBank/

And

•DIY 2- Home made Powerbank using 3 pcs of 18650 2200mAh Li-iOn battery (6600mAh)

•Links found here:

https://www.instructables.com/id/iPhoneSmartphone-DIY-Powerbank/

Step 1: Before & After Upgrade

*Images below shows the following:

Image 1 "Before"
Image 2 "After"
Image 3 "Rechargeable AA NiMh type @ 2800mAh

Step 2: *Type of Battery Connections

How to wire Batteries &

How Battery works -simplified

Image 1

•DIY 1 Powerbank using AA batteries used "Serial Connection"

Step 3: USB Step Down Chipset

•Batteries used for upgrading DIY 1 Powerbank 2800 mAh NiMh x 8 pcs in Series connection

= 1.5v x 8 = 12v dc •Upgrade from Single USB chipset upgraded to Dual USB chipset 12vdc input to 5vdc output via USB

Slot 1 = 2.1 mAh Slot 2 = 1.0 mAh

Step 4: AA NiMh Powerbank Specs

DIY 1 Project Specs:

•2800 mAh

•Weight = 220 g = 7.7 oz

•Size: Width = 3.5 " Height = 2.0 " Depth = 2.0 "

Step 5: *Performance/Tests/battery Options

Performance upon tests:

• Can full charge iPhone 4 plus 40% left juice using NiMh 2800 mAh

•Other Types of AA Batteries Specs in mAh (capacity)

•Primary (non-rechargeable) zinc–carbon (dry cell) AA batteries have around 400–900 milliamp-hours capacity •Zinc–carbon batteries are usually marketed as "general purpose" batteries. Zinc-chloride batteries store around 1000 to 1500 mAh are often sold as "heavy duty" or "super heavy duty". •Alkaline batteries from 1700 mAh to 3000 mAh cost more than zinc-chloride batteries, but last proportionally longer.

•List of other Battery Types
http://en.m.wikipedia.org/wiki/List_of_battery_sizes

Step 6: *DIY 2

•Minor upgrade was applied here(before it was transparent that can be mistaken as a dangerous device.
•Spray painted with metallic Black

Step 7: *Battery Wirings Simplified

How Battery works -simplified for this project

•DIY 2 uses Parallel Connection

Step 8: Wiring Diagram

• How to wire:

Very simple!

Step 9: *DIY 2 Project Specifications

DIY 2 project Specs:

• 6600 mAh (2200mAh x 3)

•USB and Micro USB support

- Input 5vDC via Micro USB - Output 5v DC via USB

- 800 to 1.0 Ah charger is required to charge powerbank

•with Auto Stop Charge and Discharge controller chip

• 9 hrs to full charge powerbank via MicroUsb

•Led light indicators

Blue- when discharging

Red- when charging powerbank

• compatible to any USB compliant device like mp3s,digicams,router,pocket wifi ,portable DVDs,smartphones & tablets.

•Weight =230 g

= 8.11 oz

Step 10: DIY 2 Project Specification

DIY 2 project Specs:
• 6600 mAh (2200mAh x 3)
•USB and Micro USB support
- Input 5vDC via Micro USB
- Output 5v DC via USB
- 800 to 1.0 Ah charger is required to charge powerbank
•with Auto Stop Charge and Discharge controller chip
• 9 hrs to full charge powerbank via MicroUsb
•Led light indicators
Blue- when discharging
Red- when charging powerbank
• compatible to any USB compliant device like mp3s,digicams,router,pocket wifi ,portable DVDs,smartphones & tablets.
•Weight =230 g
= 8.11 oz

Step 11: Test Results

Performance upon tests:
• Can full charge iPhone 4 and HTC Sensation up to 3 Times
from low battery stage of 15%
• Can 1 time full charge an iPad mini from low battery stage.

•added more images of upgrade