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battery_technology [2007-06-08 08:44] – external edit 127.0.0.1battery_technology [2015-12-08 12:00] – timbo
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 ==== cerf batteries ==== ==== cerf batteries ====
-the [[Cerf Board]] requires a regulated 5v supply, aprox 900mA+the [[CerfBoard]] requires a regulated 5v supply, aprox 900mA
  
 we used clones of the Sony NP-F730/750 OR NP-F930/960 infoLithium Battery which could run something like 6hrs. a not so chunky option which lasted around 2hrs is the Sony NP-F550 - 3000mAh, 7.2V. (more details in [[Cerf Notes]]) we used clones of the Sony NP-F730/750 OR NP-F930/960 infoLithium Battery which could run something like 6hrs. a not so chunky option which lasted around 2hrs is the Sony NP-F550 - 3000mAh, 7.2V. (more details in [[Cerf Notes]])
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 trickle charger However, since NiMH batteries are so very sensitive to overcharging, the best approach is to use a very low current in order to minimize overcharge damage. One frequent poster to the bikecurrent mailing list uses a charger that charges at a rate something like C/60 and has had good results with it. C/60 is the capacity of the battery in amp-hours divided by 60. So if you had a battery with capacity 4 amp-hours (4000 mAh), C/60 is 67 mA. At this current rate, the battery would be charged from empty in about 84 hours, i.e. about 3 and a half days. trickle charger However, since NiMH batteries are so very sensitive to overcharging, the best approach is to use a very low current in order to minimize overcharge damage. One frequent poster to the bikecurrent mailing list uses a charger that charges at a rate something like C/60 and has had good results with it. C/60 is the capacity of the battery in amp-hours divided by 60. So if you had a battery with capacity 4 amp-hours (4000 mAh), C/60 is 67 mA. At this current rate, the battery would be charged from empty in about 84 hours, i.e. about 3 and a half days.
 +
 +===Recovering Batteries===
 +
 +There are techniques to restore batteries, in particular lead-acid batteries, that are beginning to lose power. The main problem seems to be that they develop a layer of crystals that blocks power. The capacitive chargers that use a capacitor to limit the amps that can flow to a battery seem to pulse the layer off the batteries.
 +
 +They can be purchased: http://www.ebay.com/itm/230728215960?
 +Here is a longer [[http://makezine.com/2013/03/27/how-to-recover-a-sealed-lead-acid-battery/|make discussion]] that talks about ups and downs.
 +
 +The other main technique seems to be based around using chemicals to free the plates from the crystal layer. Epsom salts for instance.
 +Some resources:
 +http://www.warriorforum.com/off-topic-forum/525296-battery-trick-really-works.html
 +
 +December 2015. We (TU) have ordered a Da PIMP (Power In My Pocket) charger / pulser / desulphater from [[http://store.holyscraphotsprings.com/|Holy Scrap]]. We took the kit, so we need to follow the [[http://www.instructables.com/id/DP2-Da-Pimp-2-Assembly-Instructions/|instructions]] to assemble it. Some [[http://mikeysklar.blogspot.co.at/p/da-pimp-battery-desulfator.html|Instructions]] too. We will test it on several car batteries, notes to follow. We do not know what this sulphination really looks like. But I suppose we will learn.
 +
 +This [[http://www.recovermybatteries.com/index.html|product]] from the UK also looks good. And has a bit of a whinge about these "older" products. Let's see what the PIMP does. Perhaps the UK product is actually more appropriate!
  
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 Libarynth >  Main Web > BatteryTechnology r5 - 07 Jul 2004 - 13:17 Libarynth >  Main Web > BatteryTechnology r5 - 07 Jul 2004 - 13:17
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  • battery_technology.txt
  • Last modified: 2015-12-08 12:03
  • by timbo