Generic Batteries - V300 & V600

I've two working V600 and one working V300. All handsets work 100% OK with the original Motorola battery but as soon as I place a generic battery in any of these handsets I get "Invalid Battery" message. The message isn't a huge issue as most customers don't care if the new battery is a fraction of the price of an original battery!

However, not one of these handsets will charge the "Invalid Battery" which makes having the battery at all pretty useless!

All phones pass the test for failed Neptune IC as set out in Motorola Service Bulletin SB030.

Any thoughts? :confused: