Battery power

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Battery power

Postby EIZO » Thu Dec 07, 2017 10:14 pm

I like gadgets, I don't buy for the sake of buying but when I do I look into things, which is why I have two Pebbles (13200 mAh) , see photo.

I travel a lot as a photographer with Classic Cars Magazine, and rely on backups for charging, phones, batteries for cameras, etc. In fact I carry 2 car batteries in the back with a large inverter.

But having bought the scope I wanted a different battery for the dew heater etc and got this on approval from the WSC. I am keeping it.

It is so light, 96Wh, 12v charge so can be charged from the car, and with a splitter t0 4 USBs can charge all my phones and tablet.

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Re: Battery power

Postby Aratus » Thu Dec 07, 2017 10:50 pm

Battery technology has improved in leaps and bounds in recent years.
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, with an 80mm refractor as a guidescope. They are housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC for imaging.
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Re: Battery power

Postby dave.b » Fri Dec 08, 2017 12:34 am

There still seems to be a price premium for li-po batteries, which doesn't currently justify the size and weight reduction for my uses.
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Re: Battery power

Postby EIZO » Fri Dec 08, 2017 11:03 am

If you are going to buy it for just one use I agree but think about other uses to justify it

1. Charging laptops via the output
2. Emergency lighting in a power cut in winter
3. Camping charge phones, tablets
4. Telescopes etc dew controllers and drive
5.
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Re: Battery power

Postby dave.b » Fri Dec 08, 2017 11:45 am

I agree that the 5V USB lithium battery packs are pretty good and affordable - 8Ah for under £30. Probably the result of a relatively large market.

But the 12V versions with similar capacity are over £100, e.g. your Tracer is currently £139 at Amazon https://www.amazon.co.uk/gp/aw/d/B005WJ75MK. That's about twice the cost of a lead acid power tank, which in itself is an expensive way of buying a mediocre lead acid battery just to get the "nice" case.
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Re: Battery power

Postby EIZO » Fri Dec 08, 2017 1:55 pm

This is 12v output and in fact £119 and 1/5th the weight of a lead acid battery almost, why would I want to carry a large lead acid battery

https://www.widescreen-centre.co.uk/ast ... ah-lithium

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Power tank 2500g this battery 550 enough said

Oh and no memory like lead acid and 10,000+ recharges unlike lead acid and
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Re: Battery power

Postby Gfamily2 » Fri Dec 08, 2017 2:39 pm

But on the other hand it's only 8Ah, and twice the cost of my 85Ah leisure battery. True, the weight and size difference is significant, but I'm not sure it would manage two or three nights of a star party.

The specs say it's good for 300+ charging cycles, and while I agree that 10,000+ is technically 300+, I'm not sure I'd expect it to be good for 30 years of daily recharging. :)
Scopes: Meade 8" SCT, Skywatcher 127mm Mak
For imaging: Pentax K5, Asda webcam, Star Adventurer (new toy)
For companionship: Mid Cheshire Astronomical Group.
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Re: Battery power

Postby EIZO » Fri Dec 08, 2017 3:20 pm

But then again my needs are not the same as yours and I don't want a heavy pointless massive power tank, I posted this here as information about what I am using NOT to be argued with.

When at a star party I change my car battery every three years and have two from my Renault Grand Scenic in the rear with leads to the scope. Totally different to what i was talking about.
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Re: Battery power

Postby dave.b » Fri Dec 08, 2017 5:23 pm

I was comparing with a 7Ah lead acid and not a car battery sized one!
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Re: Battery power

Postby EIZO » Fri Dec 08, 2017 5:27 pm

It is still too heavy as compared with the tracer, cost is not a concern weight is
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