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If you get the extended battery for your GMRS-V1 please let us know how it works out for you and any major pros or cons compared to the stock battery. Thanks!

You might check out https://hamfiles.co.uk I have heard they have some Motorola software there, though you probably have to register first.

The only way you can legitimately acquire any Motorola programming software is to purchase it from Motorola. However, this product was End of Life'd last year, but the software is still listed on their website as available. The part number is HVN9025 and the most recent revision is R06.12.09. You must have an established account with them to purchase it. The software is called CPS (Customer Programming Software) and this radio series is known as the Professional Series. It's also known as the Waris series. Current price on the software is $265. That would normally be a 3 year subscription entitling you to free updates as they are released. Since the radios are EOL, there won't be any future updates to the CPS. There are no alternative programming options. You've got to use the Motorola CPS. If you are running Win 7 or newer, you should use R06.12..05 or newer. Older versions are not stable on Win 7 64 bit. It also requires a specific cable for use between the radio and the computer. They can be purchased inexpensively on Ebay and elsewhere in the USB version. There's a steep learning curve to programming these radios correctly. Since you only have two of them and may only reprogram them a few times, it may be more cost effective to find someone locally who can do them. Depending on the exact model of CDM1550, you may only have 16 conventional channels available to you. Post the full model number of the radio and I'll look it up for you. (I am responsible for a half dozen of the radios in our ambulance squad plus I also have several of my own, both VHF and UHF. The county where I live is 100% CDM radios for the fire service.) You may already know this, but the CDM's are not type accepted for GMRS use. That's not a criticism, just tossing out the info. You have the "S" split radios there (450 to 512). They can be hacked down to the 440 range for ham use, but it's a bit of trick involving some hex editing. The "R" split (403 to 470) models are easily found on the used market. My UHF CDM's are all the "R" split version and can do amateur, GRMS, and much of the Part 90 block. Especially for the car, get yourself a Motorola external speaker. It will improve the sound quality dramatically. They're on Ebay all the time. Let me know if you need a part number or two. Several different ones will work just fine with the CDM. I have some tan ones here now. If you're interested, drop me a PM.

Honestly, this not a particularly useful answer. Why do I say that? Simple. If you don't know the bloody FCC ID (i.e. "Grantee Code" + "Product Code" there's just no way to find the records... ...this is like giving someone a fishing pole, and line, but leaving out the hook and bait. That man is going to stay hungry.