Author Topic: PCE GT Lithium Battery Mod Guide  (Read 235 times)

MasterofBiscuits

  • Jr. Member
  • **
  • Posts: 51
PCE GT Lithium Battery Mod Guide
« on: August 15, 2020, 01:55:02 PM »
I recently added a lithum battery to my GT and there doesn't seem to be much detailed info around for this mod, so I thought I would share what I did in case anyone else wants to try it. This was based on some posts by Superkon/ Turbokon, but there wasn't much detail given on those threads.

https://i.imgur.com/cliPSOl.jpg
https://i.imgur.com/VnjcQU3.jpg

I used the Adafruit Powerboost 1000C board which is a combined balance charger and 5.2v boost converter. Superkon mentioned in one of his posts that he used a voltage divider to adjust the voltage to 5v, but there is no need to do this as the board has a voltage divider which you can modify. The datasheet for the TPS61090 )https://cdn-shop.adafruit.com/datasheets/tps61090.pdf ) even gives you the correct value to use - 1.8Mohm (instead of the original 1.9Mohm). So switch out resistor R3 for a 1.8Mohm 0805 SMD package:
https://i.imgur.com/OdGUJiB.jpg

Then wire the board like this:


There may be more efficient wiring possibilities, but this method definitely works.

I also broke out the LEDs from the board to indicate battery status. For this I used an SMD RGB LED (ROHM MSL0104RGBU1https://uk.farnell.com/rohm/msl0104rgbu1/led-red-grn-blu-700-1200-400-mcd/dp/2688619) connected with magnet wire. I put this in the TV Tuner latch hole behind some smoked perspex, and glued in the micro usb on top of it. Blue = charging, green = charged, red= = low battery. I didn't bother with the 'power on' led as it's a bit unnecessary.
https://i.imgur.com/SJBkILm.jpg
https://i.imgur.com/HPgFII8.jpg

The battery is a single cell Lipo (this board is only compatible with single cell Lipo/Li-on batteries) 3.7V 5000mAh size: 105080. When you remove the battery contacts in the compartment it fits very nicely without any cutting required and with space either side to remove the case screws when needed.

This GT has the 3.5" screen mod and I get around 8 hours of battery life and it takes about that or slightly less to fully charge. It can also charge while playing. I imagine with the original screen it will be an hour or two less than that. With the GT running an Everdrive and charging the battery it draws around 1.4A, so any decent USB 2A charger that can power a modern phone/ tablet will work fine, or it could even run off a power bank.

That's pretty much all there is to it, hopefully this is useful to someone.
« Last Edit: August 18, 2020, 02:49:33 PM by MasterofBiscuits »

Necromancer

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 20953
Re: PCE GT Lithium Battery Mod Guide
« Reply #1 on: August 16, 2020, 12:14:16 AM »
Heh, pretty sweet mod.  Thanks for sharing.   :mrgreen:
U.S. Collection: 97% complete    152/156 titles

Keith Courage

  • Hero Member
  • *****
  • Posts: 2451
Re: PCE GT Lithium Battery Mod Guide
« Reply #2 on: August 18, 2020, 05:12:46 PM »
Excellent write up. Thanks for the info.

MasterofBiscuits

  • Jr. Member
  • **
  • Posts: 51
Re: PCE GT Lithium Battery Mod Guide
« Reply #3 on: September 28, 2020, 06:32:12 PM »
I reworked this mod for one of my own consoles where I didn't want to mod the case. It re-uses the dc port for charging and is really easy to do. Note that this works only on LCD modded consoles, although you can still add a lithium battery with a stock screen, it just requires an addtional step which I will detail in another post.



Just need to remove Q502 and wire the 5v to the large pad, hook up the USB charge input to the rear pin of the dc adapter (I wired it around the board, but you can just remove the grey silicone and connect to the pin) and the ground goes on TP510.



For charging I'm using a USB cable that has changeable barrel ports: https://www.amazon.co.uk/gp/product/B07GTKBVKN/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

I've only wired one LED inside the power switch to light it up when charging is finished. A 3mm LED will just push fit which is pretty cool.



A second red/ orange LED is wired for low battery/ charging:


« Last Edit: December 08, 2020, 04:13:19 PM by MasterofBiscuits »

MasterofBiscuits

  • Jr. Member
  • **
  • Posts: 51
Re: PCE GT Lithium Battery Mod Guide
« Reply #4 on: January 01, 2021, 06:57:11 AM »
Someone messaged me asking if this works with the stock screen - it will but needs an additional adjustable boost converter for the backlight circuit. The circuit should look like this:



Remove the solder jumper BLH to isolate the backlight circuit from the input, then wire your 7v boost output to the test point just below it (or the bottom pad of the jumper). I found 6.9v works well for this voltage (make sure you set the voltage before wiring it up!)



Note: do not mount your boost converter and charging board here when using the stock screen, or you won't be able to close the case  :)

Battery life in this configuration is around 7 hours.



xelement5x

  • Hero Member
  • *****
  • Posts: 3848
Re: PCE GT Lithium Battery Mod Guide
« Reply #5 on: January 12, 2021, 05:07:21 PM »
Awww snap this is nice.  Just got an express myself and might want to add this to my mods list.
Gredler: spread her legs and push her down to make her more lively<br>***<br>majors: You used to be the great man, this icon we all looked up to and now your just a pico collecting 'tard...oh, how the mighty have fallen...<br>***<br>_joshuaTurbo: Sex, Lies, Rape and Arkhan. A TurboGrafx love story