Another Nokia battery which will serve as a replacement for 2x5W units [and others using a similar size battery] is the BL-4U. It has the same recessed contacts as the BL-5J, is about the same size and at 1110mAh/4.1Wh is slightly higher spec'ed than the original's 1080mAh/4.0Wh although below the BL-5J's 1320mAh/4.9Wh.

I used a BL-4U to replace a totally dead battery in a nuvi 255W. Removing the upper casing to expose the internal contacts [as shown in the video in Post #3] was unnecessary as it fits perfectly into a 2x5W case. In fact it's so snug it will 'click in' and stay there without double-sided tape but i used some anyway. Once the leads are unsweated from the old battery, they will also click into the recessed contacts and can be permanently anchored with a small amount of solder. I used the original Garmin wrapper but a little tape will work just as well to cover and insulate the terminals.

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