Puer Evoke 1S Battery Charging Current query

[Old Sparky]

I've been asked to check whether an Evoke 1S is charging it's battery pack properly.
Having measured the charging current via my bench PSU, I find that (a) the Battery Pack's terminal voltage as received was ca. 3.6v (b) the charging current with 3.8v applied is about 600mA. The Battery pack is a genuine PURE 'Charge-Pak' of 8800mAh capacity. Two questions are in my mind (1) How long would the battery take to reach full charge at 800mA. Is it 8800 divided by 600 or about 14 hours?
(2) Does that charging current seem right. There is no easy way to check what is between the radio's PSU i/p and it's battery pack connection. Having dismantled it, the part(s) between the PSU connection and battery connection on the main PCB are unnderneath screening covers on both sides of the board, each soldered to the PCB in several places.

[AlanBeckett]

What sort of Battery is it?
14 Hours for a NiCd or NiMH would be about right unless they're going in for fairly brutal 'Fast charging'. However, you'd expect that to be at 0.1C, that is 900mA or so.
If it's Lithium it could be a lot higher.
What does the Manual say?

Alan

[Old Sparky]

What sort of Battery is it?
14 Hours for a NiCd or NiMH would be about right unless they're going in for fairly brutal 'Fast charging'. However, you'd expect that to be at 0.1C, that is 900mA or so.
If it's Lithium it could be a lot higher.
What does the Manual say?

Alan

I don't have the manual, Alan. I'll see if the radio's owner has a copy, or maybe download one from PURE's website. The batteryis made up of 4 LIthium-Iron cells in a pack branded 'Charge-Pak E1 Li-Ion 3.7v 8800mAh'. Incidentally isn't the off-load terminal voltage of a fully charged Li-ion cell 1.2v.? If so, four in series should be 4.8v, surely, not 3.7v?

[AlanBeckett]

The Voltage of a Li-ion Battery is 3.6-3.7 Volts - http://en.wikipedia.org/wiki/Li-ion
So, it sounds OK but at that capacity I wouldn't want to short it out.

Alan

[Skywave]

Incidentally isn't the off-load terminal voltage of a fully charged Li-ion cell 1.2v.?

No. You're thinking of Ni-Cads and Nickel-metal Hydrogen cells.

Al.

[Old Sparky]

I now have the radio powered from the correct PURE psu/charger, and it is charging the battery. AFAIK the display will only indicate that charging is taking place with the set switched on, when a 'filling/emptying' battery cell symbol appears along with the frequency to which the radio is tuned, but I've just removed the power supply & the cell symbol together with 100%, after maybe a minute, 99%, appears (with the radio switched on). The next thing, no doubt, is to check the off load Battery Voltage, then see how many hours operation on both FM & DAB can be had from the fully charged battery. After approx. 3 hours continuous running on the battery, the indicated capacity is 86%. On this basis the battery would be completely discharged afer about 21 hours, although, of course, the radio would cease to function somewhat earlier as the internal impedance of the battery increased and it's voltage dropped. From the foregoing I conclude that the radio charges the battery properly, whilst the latter is in good condition.