Hi all,
I have browsed through the reviews here - there sure are a lot!
I am looking for a good battery box for my iphone and android tablet. Apple seems to be picky about their power sources. I’m tired of seeing the comparability error from my various 12v cig USB adapters. I have lots of laptop pulls to use for this. I think it would make sense to look for something between 3 and 6 18650 capacity. I would need an indication of low battery for travel.
(What about my charging laptop- I’m dreaming right?)
Does anyone own something like this that you can recommend?
Thanks!
John
I really like my ENB Tri-18650 (ENB products well reviewed and regarded). Found at FastTech here. I bought the version with the flashlight to use in my car's glovebox. Charges my iPhone 4 just fine. Has battery level indication, has over-discharge protection and cuts off charging properly around 4.20v. I'm using old laptop pulls in mine. but it does fit protected cells too.
It is only rated to 1A though and you may need 2.1A for a tablet. Others will have to chime in on ones providing 2A+ output. See HKJ's reviews on some too.
This
is the only one i own and it does, iphones, samsungs, sonys, asus tablet, nexus tablet and many others as people at work tend to pop up at any given moment when they need a recharge on site.
Thanks for the good suggestions for far. I’ll have to look up the specs on my cells to see what their minimum voltage is rated. Trying to catch a flight at dfw right now. Dead tablet in tow…
I think, according to the specs I pulled on these batteries, that these are the minimum voltages for the types of batteries I have. Which of these cells would you pick for a battery box (capacity, chemistry, minimum voltage)? I think I like the 6x 18650 box for the capacity - my tablet has a 6000mah battery. I have worked through almost all of these. I will have to go get counts on each type.
3. inr-18650 13q li ion 1300mah
3.1 Nominal Capacity 1300mAh (260mA, 2.5V discharge)
3.2 Minimum Capacity 1250mAh(260mA, 2.5V discharge)
3.3 Charging Voltage 4.2 ±0.05 V
3.4 Nominal Voltage 3.6V
3.5 Charging Method CC-CV
(constant voltage with limited current)
3.6 Charging Current Standard charge: 0.91A
3.7 Charging Time Standard charge : 150min
3.8 Max. Charge Current 4A(ambient temperature 25℃)
3.9 Max. Discharge Current
(continuous) 15A(ambient temperature 25℃)
3.10 Max. Discharge Current
(Pulse) 30A 1sec
3.11 Discharge Cut-off Voltage 2.5V but only rated at 1300 mah and low charge current.
3.14 Operating Temperature
Charge : 5 to 40℃
Discharge: –20 to 60℃
Storage Temperature 1 year : –20~25℃(1*)
3 months : –30~45℃(1*)
1 month : –30~60℃(1*)
“I pulled two kinds of cells from those batteries: INR18650-13Q and INR18650-15M. I had about 150 of these cells to play with and my tests showed that the “13Q” version delivers more watt-hours than does the “15M” under higher discharge rates even though it’s a lower capacity cell. It was a small difference maybe 10% - 15% but the 13Q proved to be better cells. What did your testing reveal?”
4. SE US18650FT– dewalt pack
Lithium Iron Phosphate
Capacity ———————————— (0.2ItA) 1.1Ah
Nominal Voltage ————————- 3.2V_ (lowest ones I have US18650V is rated at 1600mah, 10A discharge, 2.5v)_
Energy Density ————————— 95Wh/kg
Power Density —————————- 1800W/kg
Max. continuous discharge current —- 20A
Weight ————————————— 40g
5. Light blue INR INR18650 –15M
INR batteries are Li(NCA)O2 which is Lithium Nickel Cobalt Aluminium Dioxide.
Material: Li-ion
Voltage: 3.7V
Capacity: 1500mAh
Inner Resistance: 13mΩ
Discharging rate:
Standard discharge capacity: 1450mah (10A, 2.5V discharge)
Standard Charge: 1C at 1.5A
Maximum continuing discharging current: 25A
6. Red sanyo ur18650SA
Technical Parameter
Model: Sanyo UR18650SA
Material: Li-ion
Voltage: 3.6V
Capacity: 1300mAh
Maximum Continuous discharging current: 18A
7. Red sanyo ur18650A 2250 mah http://www.fasttech.com/product/1315000-authentic-sanyo-ur18650a-18650-3-7v-2250mah
Sanyo UR18650A 2150mAh 3.7V 18650 batterie lithium ion cell
Min. Capacity:
2150mah (0.2CA discharge at 25°C)
2080mah (0.2CA discharge at 20°C)
Typical Capacity: 2250mAh
Nominal Voltage: 3.6V
End Voltage: 3.0V
Charging Current (Std.): 1.51 A (0 ~ +40°C)
Charging Voltage: 4.20±0.03V
Charging Time (Std.): 3 hours
Discharging Current (Std.): 2.15 A
Discharging Current (Max.): 4.30 A
Internal Resistance: less than 100Mω (AC Impedance 1kHz)
Note: Percentage of recoverable capacity 80%
8. LS IMR18650BB
Model Number IMR18650BB
Nominal Capacity 1200mAh
Nominal Voltage 3.8V
Charging Temperature 0~45°C
Discharging Temperature –20~80°C
Storage Temperature –20~35°C
Cathode Material LiMn2O4
9. Purple ls lr18650BE
18650
LR18650BE Cylindrical Lithium Rechargeable Battery for 3.7V, 1400mAh
Model Number LR18650BE
Nominal Capacity 1400mAh
Nominal Voltage 3.7V
Cathode Material LiMn 2 O 4 Li(NiCoMn)O 2
Application Power Tools / Aeromodelling
I have had great luck with several of these. They charge everything (including apple) and seem to put out a true 2A+ (charges FAST). The low voltage protection works at around 3V. Great deal for the money.
Just a general advice: these USB power boxes are not very efficient and the capacity is not very high for charging a big tablets battery.
For example my ipad has about 43Wh battery capacity.
To charge it 50% with efficiency of 60% you would need 35Wh of power.
So you can charge an ipad half with a 4cell power bank….
Phones have a lot smaller capacities <10Wh
Just have this in mind and check how the battery capacity of you target device is to estimate how good it will work.