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Old 1st Jan 2019, 1:54 pm   #1
Jolly 7
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Default Old Ever Ready PP7 battery

Here is a recent carboot find, an unused PP7 battery. Unfortunately it is dead, but maybe the contents can be scooped out and replaced with six AAs. Not sure when this was manufactured.
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Old 15th Jan 2019, 1:17 am   #2
RojDW48
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Default Re: Old Ever Ready PP7 battery

It can be done - I bought a 're-filled' LT/HT battery for an old portable valve radio a few years back and it looked the part.
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Old 15th Jan 2019, 8:59 pm   #3
Graham G3ZVT
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Default Re: Old Ever Ready PP7 battery

Was it rechargeable, particularly the HT side?

I'm not sure how to charge 10s of cells in series effectively.
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Old 15th Jan 2019, 9:27 pm   #4
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Default Re: Old Ever Ready PP7 battery

New PP7 batteries are available here

http://www.smallbattery.company.org.uk/sbc_pp7.htm

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Old 16th Jan 2019, 10:50 am   #5
Brigham
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Default Re: Old Ever Ready PP7 battery

My experience of the Small Battery Co. is that nothing is available that isn't readily available elsewhere.
I don't know if anyone else has had a more optimistic result?
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Old 16th Jan 2019, 11:59 am   #6
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Default Re: Old Ever Ready PP7 battery

Quote:
Originally Posted by rambo1152 View Post
Was it rechargeable, particularly the HT side?

I'm not sure how to charge 10s of cells in series effectively.
NiCd or NiMH series strings can be safely charged at a suitably limited current. For long strings of Li cells the techniques used for EV batteries (typically 400V or so) could be used.

10 PP3s, the usual 90V string, could be charged individually and simultaneously with the harvest from a few boot sale raids

With a suitable screened and filtered design, it's perfectly possible to fit a low voltage highish capacity single rechargeable cell plus a couple of switching voltage converters inside an old battery case.
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Old 2nd Feb 2019, 5:13 pm   #7
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Default Re: Old Ever Ready PP7 battery

I've used strings of el cheapo (one dollar shops) 9 volt batteries to power portable valve radios - think one had 5 for the 45+ ht although another one had 10 fitted for the 90v+; and D cells for the heater current. For this battery surely 3 or 4 el cheapo 9v in parallel would do the trick?? scavenge the snap connectors off the dud one.
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