The E71 comes with a 1500mAh battery that lasts around 410 hours of standard time, the battery life in the E71 is good, but still there are some tasks that drain it pretty fast. GPS navigation is one of those, if you navigate using the GPS very often your E71 runs out of power in hours, other task that drains the battery is the HSDPA (3G), when you browse internet too much or retrieve the email very often the E71′s battery drains faster, also when you tether your E71 with your MAC or PC the battery won’t last that long.  Sometimes I found myself in situations where I could use my E71, but I don’t because the battery won’t last till the end of the day.  All this lead me to find a solution, and after some research I found it!.Some people buy an extra battery and they keep them both charged so when one drains they just switch them and they are ready to go, alhtough this might sound like a good solution there is a better one.   The standard battery in your E71 keeps the E71 running for 410h, but the Mugen Battery will keep the E71 for 492h, so the Mugen will offer 82 more hours of battery, amazing!!  The Mugen is an  extended battery but it is the same size as the standard one, so there is no need of extended cover that makes the E71 thicker. The Mugen battery is arround $40us, and they offer free worldwide shipping, you can go ahead and buy one here:

Extended Battery for Nokia E71

The best part is that when you buy the Mugen you now have two batteries, so you use the Mugen as the main battery and when it dies you just put the standard battery and you are ready to go again.  Share what you think about this extended battery! Have you ever used one?