Gamepad battery drains when not in use...

#1endoflevelbossPosted 3/23/2013 2:14:16 AM
... Is this normal?

Haven't played my Wii U in a month and battery is dead - was fully charged when I last switched off.
#2EoinPosted 3/23/2013 2:25:27 AM
Yes, all batteries do this to some extent.

Incidentally, this harms the battery and reduces its overall capacity to hold a charge, so if you care about battery life, it's best to avoid letting that happen.
#3Chocobo115Posted 3/23/2013 2:29:07 AM
Yup, happens every time once every year I bring out the Wii for a few h of play.
Batteries in Wiimotes are always dead.
#4Petey_MeanisPosted 3/23/2013 2:46:08 AM
From: Eoin | Posted: 3/23/2013 5:25:27 AM | #002
Incidentally, this harms the battery and reduces its overall capacity to hold a charge, so if you care about battery life, it's best to avoid letting that happen.

true.

letting a Li-ion battery fully discharge is the worst thing you can do it and it will greatly reduce its life.
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#5tradablefoxPosted 3/23/2013 3:01:27 AM
i heard that to best extend battery life was to drain it fully before re-charging. is this no longer true? i have a charging dock mine sits on but not sure whether to leave on incase it overcharges?
#6Petey_MeanisPosted 3/23/2013 3:04:46 AM
From: tradablefox | Posted: 3/23/2013 6:01:27 AM | #005
i heard that to best extend battery life was to drain it fully before re-charging. is this no longer true?

that was years ago and applied to nickel–cadmium batteries. Li-ion batteries should never be fully discharged.
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#7tradablefoxPosted 3/23/2013 3:09:34 AM
ok, so should i leave it charging when not in use? it sits on the dock
#8Petey_MeanisPosted 3/23/2013 3:11:16 AM
From: tradablefox | Posted: 3/23/2013 6:09:34 AM | #007
ok, so should i leave it charging when not in use? it sits on the dock

yeah that's fine.
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#9EoinPosted 3/23/2013 3:15:21 AM
tradablefox posted...
i heard that to best extend battery life was to drain it fully before re-charging. is this no longer true? i have a charging dock mine sits on but not sure whether to leave on incase it overcharges?

This is for older battery types, that had a "memory" (where if they weren't discharged and charged fully on a somewhat regular basis, they'd lose capacity). These batteries aren't very common any more.

Lithium ion batteries actually don't let you fully drain them. When the battery is almost drained, it will stop itself from providing power. Usually devices have further safety features - phones will vibrate and beep when batteries are low, or lights will flash, or warnings will appear on the screen, or whatever. These are all polite ways of saying "you're doing it wrong". For lithium ion batteries, regular partial charges are fine (and better than full discharge/charge cycles).

It can sometimes be useful to let a lithium ion battery power itself off and then fully recharge, since many devices use a software battery gauge calibrated off the battery and this can become gradually more incorrect. Phones, for example, with badly calibrated battery gauges, can report 1% battery for hours of use before finally switching off. Letting them power off and then recharging resets the calibration. Recalibration is also useful when swapping to a newer battery with a significantly different capacity.

You don't have to worry about lithium ion batteries overcharging. They stop the charge when they hit ~100%. Usually this will be indicated by a charging light that turns off when a device is fully charged. It's physically impossible to overcharge a working lithium ion battery, although you can damage one that's already fully charged by taking it off the charger, putting it back on, leaving it until the light turns off, and repeating. In other words, persistently doing an obviously silly thing.
#10endoflevelboss(Topic Creator)Posted 3/23/2013 3:27:53 AM
Guess I should start making use of the cradle then to prevent it from fully discharging when not in use - thanks.