This covert battery pack is high-powered, ultra-compact, and comes complete with a charger. It provides the same power as larger batteries at a fraction of the size and weight.
Battery Pack Features:
12VDC 4.5 Amp hour
On/Off switch in battery pack
Size: 2" x 3" x 3/4"
Weight: 0.58 lbs.
Easily concealed for covert applications
2.1mm male input for charging and 2.1mm female output plug to power your device
Life: About 500 times at 0.2C (0.2C discharge of about 500 times）
Switching Power Supply/Automatic Charger
Input: 110VAC ~ 230VAC 50/60Hz
Output: 12.6VDC, 350mA
18" power cord with 2.1mm female barrel plug
Note: Requires initial charging for 24 hours before use!
This 4500mAh battery connected to a 100mAh load should in theory last 45 hours. In reality, depending how the load changes as the battery voltage discharges, the operating temperature, the battery manufacturing tolerances etc., the actual life of the battery will surely be less.
The spec sheet states the nominal output current to be used is 350mA. We used a DC load set at 1 amp and this battery pack lasted 3 hours before reaching the low volts cutoff set at 8 volts.
If you are needing higher discharge rates, consider using lead acid gel cells, NiMH batteries or the more exotic Lithium-Titanate types which outperform the more common Li-Ion batteries.
We have also found that despite what is stated in the datasheet, the charging finished green LED indicator light on the power supply does not always light, does not always indicate a full charge and may light even when not charged fully. Therefore, using a voltmeter to measure the output voltage can ensure full and proper charging.