Tag Archives: battery

Replacing the battery on Apple Macbook Pro 13″ MC374LL/A | replacing a macbook pro 13″ battery in 10 minutes MC374LL/A

My battery started dying, I would get around 1 hour of life out of my Macbook.

Changing the battery takes around 5-10mins and requires very little knowledge.

First place the laptop screen down and locate a small philips head screw driver.

Remove the 10 screws, see locations in the image.

Once removed you will see this.

Remove the two screws holding the battery down.

Disconnect the cable from the main board and remove battery.

Insert the new battery and reverse these instructions.

Your done!


Building a 24/7 Raspberry Pi using offgrid power. Solar and battery operated outdoors. | raspberry pi 3 iot 24/7 solar panel battery charge cmtp02 wifi mesh node weather station

After doing months of research and experimentation I have finally completed my task. Building a raspberry pi with the ability to running 24/7 outdoors off grid using batteries and solar power.

Why? There are thousands of applications for this kind of setup, here are some I would like to experiment with in the future:

  • Mesh network node, over a wide area
  • Weather station
  • Outdoor wifi hotspot
  • Outdoor wireless camera node
  • Wifi bridge

Priorities. Project objectives were,

  • Cheap
  • Waterproof
  • Heatproof
  • Robust
  • Simple

Considering this was a experiment / proof of concept this was put together using things I found around the house, obviously if this was built for commercial applications the housing would need to be built using steel and this would make the costs go up. This was built using the following components and costs:

  • Raspberry Pi $49.50
  • Raspberry Pi Case $10.85
  • Micro USB Cable $1.00
  • 12v to USB Converter $5.11
  • Solar Charge Controller CMTP02 $12.00
  • Solar Panel 60Watt $59.98
  • Bucket
  • Battery AGM12-20 $65.00
  • Total: $203.44

Once I had all to components I used Styrofoam which I found in my garage to build a base which will be located at the bottom of the bucket, the objective will be to hold the battery in place and also insulate it form the suns heat. see below.





Once we have a nice tight fit, we’ll install it in the bucket. I will also use the leftover Styrofoam which I have crusted into small pieces to fill the gap between the battery and the wall of the bucket. This will stop any movement and will also provide insulation to the battery itself.



Now we need to take note, I have completed a similar experiment here where I tested the battery and Raspberry Pi alone without solar or controller. I managed to get 4 days uptime.

Next we will need to run the wires required for the solar panel, I drilled a hole at the bottom of the bucket and brought the wires up to the top. I did this because if water comes through the hole it will stay at the bottom and not harm the electronics.


Next we make another circle with the Styrofoam and fit it on top of the battery, this is where we will house the electronics. Its the safest place as the lid will be water and air tight.


Now we can connect the Solar controller CMTP02 to the battery and to the Solar panel, finally onto the 12v to USB controller.


Bringing it to life! Install the raspberry and have it connect to my home wifi network. Then seal the bucket and setup somewhere in the backyard where it will get the most sun,facing North (In Melbourne).

Now Im will testing this setup, it should run forever like this. During my first setup run, I had connected the solar panel the wrong way due to bad color coding on the cables. Now that its fixed its been running for three days and the battery is currently on fill charge.

Raspberry Pi – Experiment 3 | Raspberryi pi battery charging uptime experiment

This is the third experiment Im running to build a raspberry pi raspberry_pi_logo-svgsystem which will have the ability to run 24/7.

These first set of experiments are designed so that we can gain an understanding about how batteries can power the raspberry pi and for how long.

I bought a 20AH battery from ebay for around $65AUD, I was not wp-1476456214624.jpgpositive about the outcome because for the previous two experiments.

Boy was I wrong!

After connecting all the components I found myself checking its uptime every few hours, just waiting for it to die off!

Turns out this baby did the trick, it ended up giving the raspberry Pi a total of 4 days uptime. Thats 96 hours, I’m really impressed.

Given the uptime this will give us more than enough power for it to be connected to solar, which will be the next experiment.


Ill be connect the solar panel and charge controller, and trying to waterproof them as best as I can. Ill post photos when its completed.

Raspberry Pi – Experiment 2 | raspberry pi wifi batteries AA experiment duration

Raspberry Pi Power Experiment 2raspberry_pi_logo-svg

Raspberry Pi

Going on from my first experiment, this one will be slightly different.

I will be using a 12v to 5v USB converter and a 12v AA battery caddy. This caddy stores 8 x AA 1.5v rechargeable batteries. This design will closely simulate my end design which will include a charge controller and a 60w Solar panel.


I did not commit to this design by soldering the wiring and connecting permanently as its a quick dry run test. I simply want to test the duration in which it will power a raspberry pi with a wifi dongle.


Unfortunetly the results sucked! Taking into account that the batteries are not new, the raspberry pi ran for 4 hours and 37 minutes.


This is a poor a result and is sending me back to the drawing board in regards to my design. I need to think about getting a sealed lead acid battery with some decent capacity.


Experiment 1

Oneplus 3 | Oneplus 3 Mobile Phone flagship killer


Product Review.

Oneplus 3

From the company with the simplest naming convention, Oneplus. The model is Three and released in 2016, as usual it was released as a flagship killer!

Admittedly I bought the Oneplus 3 because I dropped and broke my Oneplus 2. Actually at this point I’m pleased with the outcome as the Oneplus 3 has turned out to be a great phone.

I don’t want to write a ten thousand word post on the phone, ill mention key points.

First point is the comment about the “Flagship Killer”, its not. I have read many reviews comparing it to the new Samsung s7 , its like comparing a Ferrari with a BMW. Both are sports cars but completely different.

Screen, awesome display. Rich and colorful.

Speed, to date its been like a sports car. Nothing slows it down. All the applications run well, no crashes.

Looks and feels nice, too nice. The new back is very slippery, until I bought a new case for it I feared for its life judging from my track record.

Connectivity it awesome too, I have not had any calls drop out or bad reception. The 4G coverage is good too.

Battery life, not good. But better than the One and Two phones. I’m a pretty heavy user, and usually phones don’t last the day for me…. But the Oneplus Three does.

Camera, really pleased. I actually went to the Tulip Festival over the weekend. Have a look at the phones I took.