e911 wrote:This cable and Li-Ion Impres battery are the last two things on my list to pick up

If you're referring to the NTN6034A battery, take note of the following bulletin (see below). I know it's old and this bulletin doesn't specifically state that battery (because I believe it wasn't even in existence back then), but I've never been able to confirm if this issue is still present with the NTN6034A on the 3000's.
For the price of that one battery, you can get several Ni-MH RNN4006A batteries which are rated at over 3000 mAh each (a very reputable seller on Fleabay has them for $15 each!). Or you can get two RNN4006B's which are 3500 mAH each. Sure, 4150 mAh is nice in the Li-Ion unit, but the price is just too high and I'm not sure if the issue stated below still exists (of course, if you've got a newer firmware, then you should be OK).
And take note that the battery gauge still doesn't show up on the display during normal operation on the 3000 with an impres battery. It only comes up on the 3000's when the battery is low.
SERVICE AND REPAIR NOTES
Bulletin
TECHNICAL INFORMATION /COMMERCIAL, GOVERNMENT & INDUSTRIAL SOLUTIONS SECTOR
If applicable, enter this information or note this bulletin number and subject material in the appropriate equipment instruction manuals and
make necessary schematic diagram changes. Enter this bulletin in the correct MASTER and CLASSIFIED INDICES for future reference.
Labor and/or parts warranty reference is limited to products sold and in use in the United States. For products sold
and in use Internationally, this bulletin is for informational purposes only. Radios that are Agency Approved must
follow designated agency guidelines.
SRN-ISO
This SRN supersedes SRN1463 SRN - 1463A
APC - 326, 620
August 2004
Informational Only
Distribution: Service: MOL: Two Way Portable
From: Accessories and Peripheral Solutions Team
Subject: XTS3000 PREMATURE LOW BATTERY ALERT/ DISTORTED OR NO TX AUDIO
Symptoms:
The XTS3000 units may experience premature low battery alerts and/or distorted TX audio when used with IMPRES “smart”
battery packs NNTN4435, NNTN4436, NNTN4437, HNN9031, HNN9032, and NTN9862.
Potential Problem Chargers:
All XTS3000 with firmware prior to R07.20.00 that uses the IMPRES “smart” batteries NNTN4435, NNTN4436, NNTN4437,
HNN9031, HNN9032, and NTN9862.
Cause:
This is due to stray or parasitic capacitance on the center data pin of the IMPRES battery packs. This capacitance can cause an
oscillating condition on the data pin, which can make the radio misinterpret and indecisive about what battery pack type is
connected to the radio. The radio software may revert to clamshell battery defaults, which is a higher low-battery alert
indication threshold and low-power output. Premature low-battery alert indication will be the result, even though full capacity
of the battery is available.
Also, if the parasitic oscillation frequency falls within the audio bandwidth, this may modulate the transmitted signal and will
be demodulated by the receiving unit as undesired audio noise.
Corrective Action:
Option 1 - Use of Battery Insulator kit RLN5649A. The kit includes battery contact insulators and instructions on how to
apply them to the battery center contact. Kits are available at no charge. Contact AAD @ (800)422-4210 for availability.
Option 2 - Upgrade software with enhanced Clamshell detection software (version R07.20.00 or greater). Please contact
Subscriber Support Team @ 800-927-2744 to obtain information to obtain the upgrade kit.
Informational Only. No Labor or Warranty Implied or Intended.