Powerbanks

[Seifer28]

just need to be careful; many fake versions of xiaomi's powerbank

Can buy from LAZADA.... 7 days return policy if theres any misrepresentation from seller part

(Bundle) 02 x EXPORT Xiaomi Mi Power Bank 10400mAh Silver | Lazada Singapore

 

[siao mei]

Thanksss cater Ham....

Sent from using GAGT

 

[cscs3]

Can buy from LAZADA.... 7 days return policy if theres any misrepresentation from seller part

(Bundle) 02 x EXPORT Xiaomi Mi Power Bank 10400mAh Silver | Lazada Singapore

Becareful. They already tell you is a export version.

 

[cherryjiyong]

dont trrst xiao mi
too cheap and soo big capaity

i trust my trusty sanyo or panasonic now from japan
is not as epic big in mah like cheapo xiaomi but it last me for years
even i can hande down to my others friend or family too

I was cheated by XiaoMi power bank. When I bought it, I was told that it is possible to charge my Xiaomi phone for some 3 circles, but the truth is only 1.5 circle at most. Still inconvenient to take around, quite heavy.

 

[caterham7]

I was cheated by XiaoMi power bank. When I bought it, I was told that it is possible to charge my Xiaomi phone for some 3 circles, but the truth is only 1.5 circle at most. Still inconvenient to take around, quite heavy.

Which xiaomi phone, and which xiaomi powerbank?

 

[agent007bond]

I was cheated by XiaoMi power bank. When I bought it, I was told that it is possible to charge my Xiaomi phone for some 3 circles, but the truth is only 1.5 circle at most. Still inconvenient to take around, quite heavy.

Where you buy? Maybe fake.

 

[eLeMeNtaLFuSiOn]

When buying power banks, the rule of thumb is to take the capacity (eg 10,400) x0.65. That gives u 6760mah of real juice. Meaning it would only be able to charge a 3000mah smartphone a little more than 2 times.

0.65 is not a hard number, it depends on the power bank and how efficient its charge controller is. The batteries in the power bank are 3.7v and the charge controller has to ramp this up to 5v in order to provide enough power to charge the phone.

That's why u will never get true 10,400mah out of a 10,400mah powerbank. Some energy will also be lost as heat.

 

[caterham7]

btw, xiaomi powerbanks are now available, without the need to wait for specific sale timings

already have the 5200 & 10400 versions; thinking of getting the 16000 version

 

[SongManKranji]

For xiaomi best buy from the website.

 

[cscs3]

When buying power banks, the rule of thumb is to take the capacity (eg 10,400) x0.65. That gives u 6760mah of real juice. Meaning it would only be able to charge a 3000mah smartphone a little more than 2 times.

0.65 is not a hard number, it depends on the power bank and how efficient its charge controller is. The batteries in the power bank are 3.7v and the charge controller has to ramp this up to 5v in order to provide enough power to charge the phone.

That's why u will never get true 10,400mah out of a 10,400mah powerbank. Some energy will also be lost as heat.

Yes correct. Better way is to find out the wattage. Eg for Xiaomi 10400ma is 37.4Watt rating. To covert it to 5.1v output. Use 37.4/5.1=7.3A which is 7300mA. Base on spec. Effecient for voltage conversion is 93% so the nett output is 7300max0.93=6789mA.

 

[LonelyMan]

There is 2 conversion rates. The one given by the power bank is to convert the energy from the battery cells as USB output, mostly at 85-90%.

The other conversion rate is the energy from the USB output to the phone, where the phone converts the 5v or so output to the phone's voltage of 3.6/3.7/3.8v. Normally this is at 70-80%.

So if u multiple 80% x 90%, u get the final % rate that can be applied into the power bank energy, say 72%. I think Xiaomi conversion rate is only 70%, so final conversion rate is at 63%.

If the power bank is 10400mah, it may be only at 3.6v or 3.7v depending on the cells used. For Li-Ion cells, I uses 3.6v. For Li-polymer cells, normally it is 3.7v. Xiaomi uses Li-Ion cells so it is 10400mah x 3.6v = 37.44whr energy. 63% of it is 23.5872whr. As the phone battery is 3.7v, then it should give u 23.5872 divided by 3.7 divided by 3000mah that gives u about 2.12 charges from 0% to 100% with ur phone off.

If u use ur phone or even keep it on, I am not surprised that u get 1.5 times charge only as ur phone will operate like it is being plug into wall charger.

 

[cscs3]

btw, xiaomi powerbanks are now available, without the need to wait for specific sale timings

already have the 5200 & 10400 versions; thinking of getting the 16000 version

Guess is no more like 5000 set sold out in few second etc.

 

[caterham7]

Guess is no more like 5000 set sold out in few second etc.

thought so too, but if you check xiaomi singapore website now

both 10400mah & 16000mah powerbanks are still available after the change on 23 jan

so supply no longer an issue, can buy without rushing