morphingstar
- Mar 1, 2012
- 58
- Joined
- Mar 1, 2012
- Messages
- 58
The original battery died. Replacement needed. Available are Power Banks, nothing else. Lithium falls under prohibited shipment. The choice is therefore small.
Data:
Old battery 1+2 ADC USB outputs. 8000 mAh, does no longer accept charge.
New Power Bank 1+2.1 ADC outputs. 12000 mAh. Charged 24h.
Tool for checking: VDC + ADC digital indicator, shows usually 5 VDC and charge current, lowest visible 10 mA.
Behavior of old battery while in good condition: Feeds the circuit with 1.5 A rush-in current, which drops to 0.85 immediately.
5 LEDs indicate battery state. It will switch off automatically at low charge level.
Load: Electronic circuit with a data display, indicates readiness immediately.
Problem: Power Bank does not feed circuit. Switch on PB. 5 VDC, as soon load is connected the voltage goes to zero. It won't swich on with load connected.
The outputs are not marked as to current or numbered. The result is same with both connections.
Test PB by charging phone: This works, 1.6 ADC consumed. The phone is switched on.
Hypothesis: PB has a voltage sensor at the output. If it can not sense 4.5 VDC (assumed value) it will switch off output, 4 LEDs going off too.
Changing internal circuitry of PB might be impossible. The solution must come from the outside.
Somehow feeding voltage to PB outlet using diode to isolate from load circuit? Then connect load.
Suggestions welcome.
The PB has other strange behavior: Kindle Fire7 charges with 0.45 A from charger while switched off. Connected to PB it "charges" with 200 ma while Fire7 is on. Power off leads to 0 charge current. Fire7 will actually discharge while fed with PB. Design logic was absent.
morphingstar
Data:
Old battery 1+2 ADC USB outputs. 8000 mAh, does no longer accept charge.
New Power Bank 1+2.1 ADC outputs. 12000 mAh. Charged 24h.
Tool for checking: VDC + ADC digital indicator, shows usually 5 VDC and charge current, lowest visible 10 mA.
Behavior of old battery while in good condition: Feeds the circuit with 1.5 A rush-in current, which drops to 0.85 immediately.
5 LEDs indicate battery state. It will switch off automatically at low charge level.
Load: Electronic circuit with a data display, indicates readiness immediately.
Problem: Power Bank does not feed circuit. Switch on PB. 5 VDC, as soon load is connected the voltage goes to zero. It won't swich on with load connected.
The outputs are not marked as to current or numbered. The result is same with both connections.
Test PB by charging phone: This works, 1.6 ADC consumed. The phone is switched on.
Hypothesis: PB has a voltage sensor at the output. If it can not sense 4.5 VDC (assumed value) it will switch off output, 4 LEDs going off too.
Changing internal circuitry of PB might be impossible. The solution must come from the outside.
Somehow feeding voltage to PB outlet using diode to isolate from load circuit? Then connect load.
Suggestions welcome.
The PB has other strange behavior: Kindle Fire7 charges with 0.45 A from charger while switched off. Connected to PB it "charges" with 200 ma while Fire7 is on. Power off leads to 0 charge current. Fire7 will actually discharge while fed with PB. Design logic was absent.
morphingstar