You are buying (1) one Sanyo 12.6 volt, 97.7Wh, 8800mAh battery pack. It can be used with any light, motor or device that runs on 12V battery.
This pack is capable of providing 49W (4.4A) continuously for 2 hours . I build the battery pack myself, in my spare time as a hobby. It takes me 1 hour to build and 2 hours to test (yes, it's a hobby).
Expedited shipping from Houston, Texas so it will arrive quickly in 1 to 3 business days for domestic destinations.
Specifications:
Maximum charge voltage = 12.6V, 4.2V per cell
Minimum discharge voltage (cutoff) = 9.0V, 3.0V per cell
Capacity = 8800mAh
Energy content = 97.7Wh (11.1V x 8.8Ah)
Continuous discharge rate = 4.4A or 49W
Pack weight: 21 oz total including connectors and shrink tubing
Pack dimension: 198mm x 50mm x 38mm - Diamond shape - [7.80 x 1.96 x 1.50in]
Main connector for charging and discharging = 5.5 x 2.1mm female power jack, center pin is positive (+), housing is negative (-)
Balance connector = JST 4-pin
Details: Unlike other 12.6V pack, this battery pack is built with a 3s JST connector. This 4-pin connector lets you manage each of the three cell groups independently. The 4-pin connector can be used with any RC balance charger to ensure exact balance between the cells. Pack capacity and longevity are maximized when the cells are in balance.
Construction: This battery pack is built with twelve (12) genuine Sanyo UR18650FJ cells (2200mAh/cell). Each parallel group is in diamond shape for maximum compactness. The configuration is 3s4p (3 groups of cells in series, 4 cells per group). Each group of cells is fully tested and capacity is matched before assembly. The battery pack is tested again after assembly.
Pack capacity test:
Balance charge the pack to 12.6V (4.2V per cell)
Discharge at 0.5C or 4.4A until 9.0V (3.0V per cell)
Any pack that has less than 8700mAh is discarded.
The pack will be shipped at the proper storage voltage, 11.4V to 11.7V. It needs to be charged up to 12.6V before use.
The Coca Cola can in the pictures is for size perspective/comparison only. It's not included in this purchase.
Thanks for looking.
Frequently Asked Questions (FAQ):
Q: I heard that RC LiPo batteries are dangerous and volative?
A: Unfortunately you heard correctly. RC LiPo for radio control toys is very unstable and highly risky. Consumer Li-Ion batteries, on the other hand, are very stable. All the batteries I sell are Consumer Li-Ion batteries. These are batteries designed for the consumers and used by all of us in our everyday electronics devices: Laptop computers, GPSes, Digital Cameras and Camcorders, PDAs, Cell phones, etc...
Q: What charger do you recommend?
A: I have owned an iCharger 106B for a few years now and I'm happy with it, however it's quite expensive. I have recently tried the $10 iMax B3 charger, it's slow but it works. I have not owned the iMax B3 charger long enough so I don't know about its long term reliability. Asides from these two, there are countless other balance chargers in the market that I have not tried yet, they should work too. The price ranges from about $8 to over $100.
Q: Is there a Protection Circuit Board (PCB) in this battery pack?
A: No. The battery pack is intentionally built without a PCB. Contrary to popular belief, a PCB does more harm than good to a battery pack. A PCB prevents the battery pack to be balanced. All lithium battery goes out of balance as the batterier age, there is no exception.
Q: Without the PCB, can the battery be overcharged?
A: No. The battery pack is designed to be charged with a balance charger. When the JST connector is used with a balance charger, the charger ensures that all cell groups are fully charged and balanced. A balance charger does not overcharge a pack.
Q: Without the PCB, can the battery be overdischarged?
A: Most devices (headlights, flashlights...) have built in battery gauges. The MagicShine lights, for example, have multi color LED to indicate the battery state. Green is fully charged, Blue, Orange, Red and flashing RED for almost empty battery. Other lights or devices will shut themselves off when certain voltage is reached. 6.0V for an 8.4V pack, 9V for 12.6V pack, etc...