If you were wondering exactly what Nokia's cryptically-titled 1600.2483.8106.11500 Lumia 800 update did, you weren't alone. Numerous people have taken to the company's forums to share their experiences, with many reporting a decline in battery performance — the opposite of what the update was supposed to fix. The Lumia 800 team contacted a community manager to give more details on the update, and it seems that from their side at least, the battery issue has been fixed. The team goes on to offer some tips for optimal battery usage, and promises fixes for separate audio and camera issues in future updates.

The full statement is at the source link below, with some highlights here:

  • First of all, the primary target of the latest Lumia 800 update (1600.2483.8106.11500) was to enhance standby time as well as to bring an improvement to the issue reported by some customers in December, that their phone wasn't able to access the full battery charge capacity correctly. We can confirm that we have successfully tested that those improvements are working.
  • Additionally, we've noted your concerns regarding audio and camera settings and are going to address those in a series of future updates, ie. these will not be included in this specific update.
  • Also always use the original Nokia Fast USB Charger AC-16 or the Nokia Charging and Data Cable CA-185CD that came with your Lumia 800, as they are specifically designed to charge the Lumia 800 as efficiently as possible. Only a charger with an output of 1000mA will fully charge your Lumia 800 battery. If you have several Nokia chargers at home, just check the respective labels or plastic parts as the product name is mentioned there.
  • Last but not least, the Diagnostic App was designed for internal testing purposes. In general, your battery is fine as long as the full charge capacity is more than 1000mAh. For the future, if you are checking your battery life, more useful information on the Battery status can be found by focusing on Settings>System>Battery saver.