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Root Battery level when flashing

C

cashmere_cat

Well-Known Member
Does it matter / make a difference what the battery level is at when you flash a rom? I've seen some people say that the battery must be at 100% when flashing, in order to get the best battery performance.

Also been wondering about battery calibration. I've seen 'wipe battery stats' in the CWM recovery menu, but not exactly sure the use of it. Also been seeing reference to an app 'Battery Calibration'. Anyone have any comments on it?
 
The 100% warning is usually so you don't ruin out of juice. You'll not need that and I'm usually happy with 50% or more. Even a nadroid backup, reflash and 10 minute or so dalvik cache rebuild doesn't take that much battery. Never used the battery recalibration myself - in CWM or any apps.
 
hi CC.

ah yes the old battery issue :-)

I think its all a load of bunk really. but that is based on my experience
with it. my phone is normally on high but not full battery when I flash.
and I've done many battery stats resets. but doesn't really make any
difference to battery use.
the only thing the stats reset can help with is when you get a mismatch
between the phone on fully charged level and phone off level.

in conclusion. desire battery not great and if you use the phone a lot,
there is bugger all you can do about it :-D

.....but that is just my thoughts :-)

cheers
dan
 
the idea for full battery is that users that are new to rooting/flashing dont do it on 20% and then brick the phone during the process.. aside from that i didnt have any problem with flashing on 60% or even 40%. battery still works well for me (ofcourse this still depends on rom/kernel/config).
 
saltire said:
Don't know what that battery calibration app does differently over just wiping stats from recovery - wiped stats in recovery before when changing ROMs but doubtful if it did anything :rolleyes:
Click to expand...

You run it from 2% before your battery normally shits down (so set it up at 17% if you normally shut down at 15%) then just before shut down, plug in the cable as it instructs.

Then it charges to 100% (dont touch the phone at all during this) and it works out that between 15% and 100% should actually be 0% and 100% so it re-adjusts everything accordingly.
 
SU yeah that's for the advanced method on the Oxygen forum, i thought the OP meant one of the other calibration apps on the market and was referring to that (ah, what's in the head doesn't always translate to the typed word)

You tried the advanced way? Bit I can't figure out is does it actually then give you a bit more battery time as it won't shut down prematurely at say 15%, or does it just re-calibrate the usage percentage over time so same length of time for charge overall.
 
saltire said:
Bit I can't figure out is does it actually then give you a bit more battery time as it won't shut down prematurely at say 15%, or does it just re-calibrate the usage percentage over time so same length of time for charge overall.
Click to expand...

It doesn't last longer, it just makes more sense. It "Appears" to drop quicker because essentially each percentile is worth less battery as there are more of them in the same space (from 85 to 100) and I always forget about the 15% further to go, so never stop worrying that I am at whatever% much sooner than I would have been previously.

GrenW said:
Yep, that's what I normally say when the battery runs down :p
Click to expand...

Ooops
 
just done a batt reset on my cm7 - looking good so far - but with light use - 98% after 2 hours :)

93% after about 5 hrs - light use though
 
Define "light" :)

Today my phone's been in "dumb phone" mode, as I'm in meetings abroad (so both busy and not using cellular data). Mostly silent, screen off, data off, 2G. Perhaps 40 mins screen on, but much of that being with GPS navigation, most of rest being WiFi downloads. After 21.5 hours I had 75% left. dGB/ManU FTW :D

Back on topic, the only thing that matters is that you don't power down during the flash. If you need 100% your battery is knackered and you shouldn't do anything. As others have said, it's just to stop people flashing when they are at risk of the flash being interrupted by a shutdown, so do a few and see how much is typically used, then add your normal shutdown percentage and allow some extra margin for error, and you'll know what the real limit is.
 
hi Hadron,

wow - 21 hrs and 75% :o that is very good

by light i mean a few emails a couple of web pages and also a few texts - mainly it has been screen off and with 3g data on

it is now at 89% after 6hrs

cheers
dan
 
Yeah, while dGB is in my experience better than CM for battery, I used CM for a few months this year and you don't have to charge every day if used lightly.

Remember that I have 3G off (I have data off, as data roaming is the biggest uncorrected rip-off, so I may as well turn 3G off altogether). Makes a difference. But I've always said that if I actually used my Desire like my old RAZR (couple of texts, 1-2 short calls/day, otherwise off in my pocket) it would last a similar time. But that's not what we do :)
 
:D exactly - if i turn 3g off and make sure the screen does wake - mine might just make 2 days - but why bother :/ ....especially when youve got a lovely new rom to play with :D
 
Ah, a new ROM. I'm quietly amazed that I've been using the same ROM since late August (apart from a couple of brief forays into Redux2). But I don't actually feel the need to change right now.
 
are you sure that is accurate - you said you tried cm earlier this year ;)

im very new to the whole rom game - so ive just been trying everything that sounds good :D started with miui au, then xj, then redux2, then dGB, then oxygen 2.2 and finally cm7 - will probably stick with cm7 for a bit as it is quality imo - unless it gets to heavy for my phone - but then i still need to gpart it etc

i have to say though that all this rom swapping would have been a totaly nightmare without titanium :) thats a cool app
 
Yeah, 'tis accurate.

I mainly used GingerVillain until a little after Easter. Then mostly CM until August. Used Miui XJ for a couple of weeks, then flashed dGB about end of August.

Of course there has been some messing around with other ROMs inbetween. I've used Redux and Redux2 for short spells in that time, a couple of short visits to Oxygen, but for extended use (more than a week) it's been those ROMs listed above.
 
so fairly quiet on the rom flashing fron then :D

might stick with this one now until dGB1.5/dICS comes along ;)
 
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