Just bought myself a Uniross Sprint 90 AA battery charger, primarily on
the basis of it having an intelligent charging system.

http://www.batterylogic.co.uk/Uniross-sprint-90-minute-charger-rc104318.asp

However, it only takes 90 mins to charge two AAs, or 3 hrs to charge 4.

AIUI it's important to charge slowly to avoid frying the batteries...
why is it that every damned charger you see advertised crows about how
quickly it recharges batteries! Why can't I find one which will happily
trickle charge overnight?

Or am I worrying too much?

I'm assuming that it will be better if I charge my batteries 4 at a
time, not 2: is that right?

Thanks
David

On 05/05/2007 13:37, Lobster wrote:

Or am I worrying too much?

It has deltaV charging, which means it monitors charging progress and
will fast charge until the battery is almost fully charged, then switch
to trickle charging.

Although I notice it has to charge in pairs, so perhaps it doesn't
monitor each cell individually, which better chargers do (and which I
thought was the /point/ of deltaV)

On 5 May, 13:37, Lobster wrote:
Just bought myself a Uniross Sprint 90 AA battery charger, primarily on
the basis of it having an intelligent charging system.

http://www.batterylogic.co.uk/Uniross-sprint-90-minute-charger-rc1043...

However, it only takes 90 mins to charge two AAs, or 3 hrs to charge 4.

AIUI it's important to charge slowly to avoid frying the batteries...
why is it that every damned charger you see advertised crows about how
quickly it recharges batteries! Why can't I find one which will happily
trickle charge overnight?

Or am I worrying too much?

I'm assuming that it will be better if I charge my batteries 4 at a
time, not 2: is that right?

Thanks
David

I have a Uniross Sprint 15 which charges 4 AAs NmiH in about 15 -20
mins. It has got a fan onboard. They get pretty hot but have had no
probs with them on about 50 cycles so far.

Lobster wrote:

However, it only takes 90 mins to charge two AAs, or 3 hrs to charge 4.

[snip]

I'm assuming that it will be better if I charge my batteries 4 at a
time, not 2: is that right?

At a guess it probably charges the first pair in about 90 minutes then
switches over to charge the next pair for the next 90 minutes. So it makes
no difference to the charge rate seen by the cells. That's what mine does,
though it's not a Uniross.

--
Mike Clarke

Lobster wrote:

Or am I worrying too much?

Yup. It is ok to fast charge cells, but not to fast overcharge them. So
long as it has logic to detect when the cells are charged you will be fine.

I'm assuming that it will be better if I charge my batteries 4 at a
time, not 2: is that right?

Not going to make much difference.

--
Cheers,

John.

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"Lobster" wrote in message
...
Just bought myself a Uniross Sprint 90 AA battery charger, primarily on
the basis of it having an intelligent charging system.


http://www.batterylogic.co.uk/Uniros...r-rc104318.asp


However, it only takes 90 mins to charge two AAs, or 3 hrs to charge 4.

AIUI it's important to charge slowly to avoid frying the batteries...
why is it that every damned charger you see advertised crows about how
quickly it recharges batteries! Why can't I find one which will happily
trickle charge overnight?

Or am I worrying too much?

I'm assuming that it will be better if I charge my batteries 4 at a
time, not 2: is that right?

Thanks
David

As a side note, I have a uniross something or other. It says it takes 19
hours to recharge a pair of 2200 mah batteries

after 19 hours they are pretty hot

is that bad ?

Dave wrote:

As a side note, I have a uniross something or other. It says it takes 19
hours to recharge a pair of 2200 mah batteries

after 19 hours they are pretty hot

is that bad ?

Depends a bit on where the heat is coming from. If it is a result of
overcharging the cells, then it is not good for them. If however it is
just that the charger itself gets hot and that in turn heats the cells
then there is less to worry about. It sounds like it is not charging at
a very fast rate anyway (i.e. under 150mA). This is still quick enough
to damage cells on an overcharge, but not quite as quickly as some of
the very fast chargers that only take an hour or two.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
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