Posted by Martin on August 23, 2011, 5:20 am
Two Fridays ago Monty Don demonstrated a battery powered hedge cutter.
He said it had two batteries, whilst one was on charge he used the
other. Both charging and discharging lasted an hour. Normally it take
a lot longer to recharge a battery than to discharge it. Which
make/model of hedge trimmer was it? Is it really possible to fully
recharge one battery in the same time it takes the other to discharge
while it is being used.
I suspect the electric vehicle industry would be interested in the
batteries used.
--
Martin
Posted by Martin Brown on August 23, 2011, 5:44 am
On 23/08/2011 10:20, Martin wrote:
> Two Fridays ago Monty Don demonstrated a battery powered hedge cutter.
> He said it had two batteries, whilst one was on charge he used the
> other. Both charging and discharging lasted an hour. Normally it take
> a lot longer to recharge a battery than to discharge it. Which
> make/model of hedge trimmer was it? Is it really possible to fully
> recharge one battery in the same time it takes the other to discharge
> while it is being used.
Colour me cynical about that. My experience of battery powered hedge
trimmers is that they last hardly any time at all doing real work. And
the batteries die a horrible death after a couple of seasons.
The main annoyance was the sheer weight of battery needed for a puny 15
minutes useful work and the way it stalled so easily.
> I suspect the electric vehicle industry would be interested in the
> batteries used.
I'd believe you might get away with three sets of batteries and a very
sophisticated fast charger. But not with a pair. To charge at that rate
would mean that the battery got rather hot and as such at that
temperature would be very unhappy to immediately be discharged again.
Mains electric powered is still about the least hassle even if there is
a risk of cutting the cable in a moment of absent mindedness.
Regards,
Martin Brown
Posted by hugh on August 23, 2011, 4:56 pm
>On 23/08/2011 10:20, Martin wrote:
>> Two Fridays ago Monty Don demonstrated a battery powered hedge cutter.
>> He said it had two batteries, whilst one was on charge he used the
>> other. Both charging and discharging lasted an hour. Normally it take
>> a lot longer to recharge a battery than to discharge it. Which
>> make/model of hedge trimmer was it? Is it really possible to fully
>> recharge one battery in the same time it takes the other to discharge
>> while it is being used.
>Colour me cynical about that. My experience of battery powered hedge
>trimmers is that they last hardly any time at all doing real work. And
>the batteries die a horrible death after a couple of seasons.
>The main annoyance was the sheer weight of battery needed for a puny 15
>minutes useful work and the way it stalled so easily.
>> I suspect the electric vehicle industry would be interested in the
>> batteries used.
>I'd believe you might get away with three sets of batteries and a very
>sophisticated fast charger. But not with a pair. To charge at that rate
>would mean that the battery got rather hot and as such at that
>temperature would be very unhappy to immediately be discharged again.
>Mains electric powered is still about the least hassle even if there is
>a risk of cutting the cable in a moment of absent mindedness.
>Regards,
>Martin Brown
Glad I resisted the temptation recently and bought mains powered
--
hugh
Posted by Janet on August 23, 2011, 6:18 pm
>
> >Mains electric powered is still about the least hassle even if there is
> >a risk of cutting the cable in a moment of absent mindedness.
Yes.. but only if the hedge is within reach of a power supply. Monty's
garden is pretty big so he probably has to choose between a charger, and
petrol driven.
Janet
Posted by Martin Brown on August 24, 2011, 4:31 am
On 23/08/2011 23:18, Janet wrote:
>>
>>> Mains electric powered is still about the least hassle even if there is
>>> a risk of cutting the cable in a moment of absent mindedness.
> Yes.. but only if the hedge is within reach of a power supply. Monty's
> garden is pretty big so he probably has to choose between a charger, and
> petrol driven.
> Janet
So he chooses a tool that is so very clearly not up to the job?
I wonder if he will report back when it fails dismally next year?
If his garden is that big then only a petrol hedge cutter will hack it.
30 & 100m mains extension cables are not that expensive.
Regards,
Martin Brown
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> He said it had two batteries, whilst one was on charge he used the
> other. Both charging and discharging lasted an hour. Normally it take
> a lot longer to recharge a battery than to discharge it. Which
> make/model of hedge trimmer was it? Is it really possible to fully
> recharge one battery in the same time it takes the other to discharge
> while it is being used.