1. AndroidJelly's Avatar
    Hi i bought lumia 620 a month ago and i got my old phone Nokia Express Music 5800 and i noticed that my older phone got 1320mah battery and the lumia 620 got 1300mah. Should dat 20mah make the difference?!I saw that the battery can be inserted in both phones so should i change it? Or i can buy also a lumia 520 battery and put into the lumia 620.. Will it work?
    Last edited by AndroidJelly; 01-14-2015 at 06:22 AM.
    01-14-2015 06:12 AM
  2. Harrie-S's Avatar
    The lumia 620 has a BL-J4 battery and the 5800 a BL-J5.The size is the same except the thickness. The BL-J5 is a little thicker.
    I do not think that the 20 mA makes a big difference but maybe one of them is in "better" shape than the other and that may make a difference.

    In below post you can read that people tried it and it worked
    Mobile Community - Will a Nokia 520 battery(BL-5J) fit in a Nokia 620... - Microsoft Mobile Community
    01-14-2015 06:35 AM
  3. AndroidJelly's Avatar
    Thanks for reply , but what about Lumia 520's battery ? it has the same thickness with 5800 but it has 1430mah . What you think ?
    01-14-2015 10:52 AM
  4. Harrie-S's Avatar
    The battery with the highest mAh will last the longest so theoretically it will last 9% longer. But if all batteries are already used than there is no way of predicting which will last the longest.
    01-14-2015 11:01 AM
  5. AndroidJelly's Avatar
    I think to buy a new 520 battery so the battery can last longer...
    01-14-2015 11:05 AM
  6. Harrie-S's Avatar
    If you checked with your old 5800 battery that you still could close the backcover your good.
    01-14-2015 11:29 AM
  7. Aziz Abdurachman's Avatar
    Hi, I'm lumia 620 user, I've been using BL-5J for about one year, the new BL-5J is about 1430, so it give more up to 10% capacity.
    There is a piece of plastic/rubber thing inside the battery cover, you need to trim it completely in order to fit the battery inside.

    And about battery capacity, it's not an absolute measurement, it may be slightly higher or lower , and over the time it's capacity would drop. That mean if you use your old battery it could be around 75-85% rate of label.
    Also don't believe conventional "double-power battery", battery is just like a gallon of gasoline, in order to make a double capacity battery you need more cell of battery, like more volume of gasoline. The reason of nokia's new battery is slightly higher is because they use thinner electronic circuits to give more space to battery cell to fit in.
    Last edited by Aziz Abdurachman; 01-14-2015 at 06:52 PM.
    Harrie-S likes this.
    01-14-2015 11:32 AM
  8. AndroidJelly's Avatar
    How do you think should i buy that battery ?
    01-15-2015 06:01 AM
  9. Harrie-S's Avatar
    That is your call. It can be used and you get 10% more juice. But if this battery is for example 50% more expensive as the original I would not do it.
    01-15-2015 06:57 AM
  10. Aziz Abdurachman's Avatar
    That's your choices, like what Harrie-S said.
    But if you have been using your battery for more than 2 years, I think you should try it. Since average battery lifespan is about 1000-1500 cycle of charging, and average people charge a phone once to twice a day, it would give about 2 years before capacity start to roll down.
    01-15-2015 08:11 AM
  11. AndroidJelly's Avatar
    I already told you that i've got only 1 month that i bought it !.
    01-15-2015 02:52 PM
  12. winphoneaddict's Avatar
    Been using a BL-5J in my 620 for several months now. It definitely performs better than the stock battery, but only marginally. But, any improvement is always a plus.
    01-15-2015 06:06 PM

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