I was disappointed with the results of the previous mod.
Seems like a waste to only get 20% out of a whole other lithium battery by feeding back through the 5v
So I decided to try and figure out if there was a way to send the juice to the Battery input instead.
I also wanted to add another Battery.
This would give me 3 x 2200mAh batteries.
Hook them up in parallel and we get a 6600mAh 3.6v Lithium Battery.
In theory it should last between 24-27 hours.
They should recharge as normal from the PSP's 5v DC trickle charge.
I did run into a snag that I wasn't expecting.
I am not sure exactly why but i think it has something to do with the way the PSP boots.
The PSP will not turn on if it does not receive a valid serial number.
Or more basically if the middle pin, 2, is not connected at the same time the initial 3.6v is applied to pins 1 and 3.
So it is impossible to power the PSP on pins 1 and 3 using battery input power alone.
The solution is to power up the PSP on a single standard battery and then turn on the extra power with a switch.
Once the PSP is on the switch can be turned on or off and the PSP can be shutdown and restarted normally.
The only time the switch to the external batteries ever needs to be used again is if the PSP is ever completely run down on battery power or if the batteries are disconnected.
Here are some pics from the MOD minus the switch I need to finalize the mod.
I will post that as soon as I find the perfect one.
NeoPad external battery mod.
24+ Hours Battery Life
3 x 2200mAh = 6600mAh
Get the wire I want to use from an 80pin IDE cable.
Make little loops on one end of the cable.
Align the Loops around the battery header.
Not shown here are some small strips of masking tape that I used to help hold the wires in place.
Usually Red is for positive but I Reversed the loops here by accident. (Yikes!)
Please know that:
Pin 1 is Negative
Pin 3 is Positive
Snap the battery in place and it holds everything snuggly into place:
The battery cover still slips cleanly into place:
Remove the 5v DC wiring harness from the NeoPad
Wire up the second battery in parallel with the first.
At this point I decided to replace my two wire power connector with a strip of 5 wires from the 80wire IDE cable.
It just seemed a whole lot stronger and I did want to risk a short.
So I used the 3 extra wires to simply separate the positive and negative wires from each other a little more.
Turn on the PSP with a single internal battery.
Connect the NeoPad Battery pack to the PSP.
Check the battery PSP meter
24 hours... Much Better!
No switch no reset the battery pack for now
Looks Ugly as hell.
But its time to take a break and recharge my batteries.
I will post a pic with the final switch in place.
It should look a lot better... not to mention safer.