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| battery_technology [2007-07-16 17:06] – nik | battery_technology [2015-12-08 12:03] (current) – timbo |
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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. |
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| | ===Recovering Batteries=== |
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| | 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. |
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| | 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. |
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| | 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 |
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| | 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. |
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| | 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! But it is only a desulphinator, albeit one that is always operational. It keeps batteries healthy for longer. The PIMP will recharge and desulphinate. So for now, we try the PIMP. If we end up with more complex systems, we can worry about the others. |
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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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nik