DrkAngel
1 GW
Tenergy 25.9v 2A charger - Next step in testing will be with my 25.9v, 26ah Lithium-ion Polymer pack.
Then, for a "real" trial I will run down my Li-ion pack to 4v/cell, then charge 1 bank to 4.1v.
Monitored charge, will then, proceed.
Interesting note about the Tenergy charger. Even after the charge light turned green, the charger continued to pulse voltage, fairly standard, except that the pulse dropped noticeably below the applied voltage. Battery voltage measured higher after disconnecting the power supply!?
Added note:
Strange was that the high and low pulses were both below the pack voltage after the charger was removed!
Probable explanation - Charger provide an extremely short duration higher voltage "spike" followed by a longer duration, lower voltage drain. (My $30 digital multimeter did not fully recognize the brief, higher voltage, charge portion of the cycle, due to low sampling rate, or buffers.)
Might indicate a balancing algorithm?
Charge-discharge-charge-discharge - cycles every 2-3 seconds.
Premise 1 - A lower voltage cell will accept charge more easily than one with a higher voltage.
Premise 2 - A higher voltage cell will expend energy more easily, (faster), than lower voltage cell.
Given these 2 reasonable premises, then the chargers, charge-discharge pulsing, would tend to equalize, (balance), Li-ion cells! ... ?
Then, for a "real" trial I will run down my Li-ion pack to 4v/cell, then charge 1 bank to 4.1v.
Monitored charge, will then, proceed.
Interesting note about the Tenergy charger. Even after the charge light turned green, the charger continued to pulse voltage, fairly standard, except that the pulse dropped noticeably below the applied voltage. Battery voltage measured higher after disconnecting the power supply!?
Added note:
Strange was that the high and low pulses were both below the pack voltage after the charger was removed!
Probable explanation - Charger provide an extremely short duration higher voltage "spike" followed by a longer duration, lower voltage drain. (My $30 digital multimeter did not fully recognize the brief, higher voltage, charge portion of the cycle, due to low sampling rate, or buffers.)
Might indicate a balancing algorithm?
Charge-discharge-charge-discharge - cycles every 2-3 seconds.
Premise 1 - A lower voltage cell will accept charge more easily than one with a higher voltage.
Premise 2 - A higher voltage cell will expend energy more easily, (faster), than lower voltage cell.
Given these 2 reasonable premises, then the chargers, charge-discharge pulsing, would tend to equalize, (balance), Li-ion cells! ... ?