The original battery is Garmin 361-00038-01, 3.7V, 1800mAh, 6.7Wh, made in Japan.
ActiveGPS sell an OE battery for 45 GBP, others made in China are about half that price.
Has anyone purchased a replacement battery and if so, what did you go for and where did you get it from, thank you.
Looks like the Garmin part no. is now 010-11143-00.