|1250mAh Li-Polymer rechargeable DC 3.7V battery.Compatible Models: Garmin Nuvi 255W series|
This was exactly what I needed to keep my GPS running. The original battery would only run for about 30 minutes and would drop from full charge to 1/4 charge after about 10 minutes. This replacement battery worked excellently. Be very careful opening the GPS so you don't tear the motherboard ribbon.