Tag Archives: battery

Electronics and Computers, Palm, Posts

Replacing the Battery in a Sony Clié PEG-TH55

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Replacing the Battery in a Sony Clié PEG-TH55

If you’re looking for a new battery for your TH55, the size you’re after is a 503759. These are available as 1300mAh batteries from AliExpress. I specifically got this one, if the listing is still available, making sure you pick the right option from the listing as it is for multiple sizes. They can be bought elsewhere as singles, but I bought 10 because I’ll need them eventually and they’re cheaper in bulk.

Perfectly Fitting Battery

To get into the battery compartment you’ll need a tri-wing security bit (basically like a Philips bit, but with only three corners). I have a 2.0mm size one that works well.

Tri-wing Screw

You’ll likely need to transfer the connector from the old battery to the new, which should be done by soldering, ideally replacing the cable where it is connected to the protection circuit board on the battery as the fit is tight. If you splice the cable, make sure you cover the joins with heatshrink (remember to put it on the wires before you solder them). Ensure the wires are at least 60mm long.

The Old Battery Being Removed

When fitting the new battery, they tend to catch on ribbon cables in the battery bay, so push a bit of thin paper, such as a receipt, into the opening between the rear case and ribbon cables so that it covers them, and then slide the battery in between the paper and rear case. Then pull the paper out.

Using a Receipt to Hold Ribbon Cables out of the Way

It is also advisable to loop some tape around the battery as a tab to pull it out as it is a tight fit.

Arduino, Electronics and Computers, Posts

Rechargeable Battery Power

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I’ve quickly cobbled together a rechargeable lithium battery circuit and stuck it into a box with an Arduino, a temperature / humidity sensor and a temperature / pressure sensor.

It hasn’t exploded yet.

This was the circuit I used to test it was working (using the battery charger and step up DC-DC converter to power my flammable gas sensing circuit, because it was within reach).

Charging Circuit

This evening I re-wrote an Arduino program of mine that takes measurements from a DHT22 temperature / humidity sensor and BMP180 temperature / pressure to make it work with and Arduino Nano with an LCD screen attached. I’ve not used a Nano in ages, but sadly, I needed the 3.3v regulator to drive the BMP180. Hopefully it won’t be drawing much current and so not wasting much energy, after I went to the effort of using a reasonably efficient step up converter. I did check, and the voltage straight from the battery is also too high. Future plans include… not using 3.3v sensors.

Here is a video of the box running off the battery.

I’ll tidy up the circuit – perhaps move it from breadboard and a pile of bits onto protoboard, make the charging port accessible, add a power button, menu buttons, battery voltage monitoring, auto power down for low battery / after inactivity and perhaps add an external 1 wire bus for DS18b20 sensors. At that point I’ll document what I’ve done a little better.