dry charge battery
I know modern battery technology is supposedly different to what it was 30 years ago but does anyone know if it is still okay to store a dry charged car battery? I have a spare and want to charge it, drain the electrolyte and seal it. I remember getting single glass cells in like that for a telephone exchange years ago. |
dry charge battery
On 16 Feb, 17:05, Alang wrote:
I know modern battery technology is supposedly different to what it was 30 years ago but does anyone know if it is still okay to store a dry charged car battery? Yes, but don't put the contents back into the cells (or mix between cells, but that's old advice anyway). About 15 years ago, cell lifetimes improved massively when they started to use permeable cell separator bags - a porous membrane which avoided many of the failure modes based around a build-up of conductive sludge around the bottom of the plates. If you mix crud from both inside and outside the bag (still from within the same cell), then you're losing most of the benefit. |
dry charge battery
On Mon, 16 Feb 2009 10:07:24 -0800 (PST), Andy Dingley
wrote: On 16 Feb, 17:05, Alang wrote: I know modern battery technology is supposedly different to what it was 30 years ago but does anyone know if it is still okay to store a dry charged car battery? Yes, but don't put the contents back into the cells (or mix between cells, but that's old advice anyway). The electrolyte? As long as it's all the same SG it should be ok I would have thought. I was just going to bottle it, flush the cells and seal the battery with tape to keep the air out. About 15 years ago, cell lifetimes improved massively when they started to use permeable cell separator bags - a porous membrane which avoided many of the failure modes based around a build-up of conductive sludge around the bottom of the plates. If you mix crud from both inside and outside the bag (still from within the same cell), then you're losing most of the benefit. I used to wash the crud out of cells as part of routine maintainance. Extended the life significantly. I have two car batteries. One is completely sealed from external probing. At least I can't se a way of getting into it. The other is one that still has fillers where you can get a hydrometer in. That's the one I want to try and store. The alternative is putting it on trickle charge and hoping it doesn't die before I want to use it |
dry charge battery
Alang wrote: [...] I have two car batteries. One is completely sealed from external probing. At least I can't se a way of getting into it. The other is one that still has fillers where you can get a hydrometer in. That's the one I want to try and store. The alternative is putting it on trickle charge and hoping it doesn't die before I want to use it Myself, given a choice, it's the modern 'maintenance free' one I'd be keen to store. Charge it, store and forget. Typical English climate and it'll sit there for a year and retain maybe 90% charge. In stark contrast to those hi-falluting, hi-tek, hi-price Ni/Li types which lose about 5% a day. Gimme a drill fitted with an SLA any day :) |
dry charge battery
On 16 Feb, 18:17, Alang wrote:
On Mon, 16 Feb 2009 10:07:24 -0800 (PST), Andy Dingley Yes, but don't put the contents back into the cells (or mix between cells, but that's old advice anyway). The electrolyte? As long as it's all the same SG it should be ok I would have thought. * Only if it's pure, clean acid. If it's the usual collection of dissolved crud, then it's not a good idea. I was just going to bottle it, flush the cells and seal the battery with tape to keep the air out. I have a pair of 6V batteries for a '30s MG, although I think they're '50s vintage. Three glass cells in a wooden crate. They were drained and stored in the '50s, then when refilled 40 years on they worked fine. I plan to use them again, when I get round to it. The alternative is putting it on trickle charge and hoping it doesn't die before I want to use it Trickle will kill them too - you want float, and ideally temperature compensated. Or else charge intermittently, but regularly. You can buy a float charger from Optimate, although everyone I've heard from who has one has also had it kill batteries in a pretty short time. |
dry charge battery
Alang wrote:
On Mon, 16 Feb 2009 10:07:24 -0800 (PST), Andy Dingley wrote: On 16 Feb, 17:05, Alang wrote: I know modern battery technology is supposedly different to what it was 30 years ago but does anyone know if it is still okay to store a dry charged car battery? Yes, but don't put the contents back into the cells (or mix between cells, but that's old advice anyway). The electrolyte? As long as it's all the same SG it should be ok I would have thought. I was just going to bottle it, flush the cells and seal the battery with tape to keep the air out. Surely that would store it wet. You need to let it dry out. Since sulphuric is hygroscopic it'll need a single rinse with deioninsed to be able to dry properly. Only a single rinse, repeat rinsing is known to kill plates. About 15 years ago, cell lifetimes improved massively when they started to use permeable cell separator bags - a porous membrane which avoided many of the failure modes based around a build-up of conductive sludge around the bottom of the plates. If you mix crud from both inside and outside the bag (still from within the same cell), then you're losing most of the benefit. I used to wash the crud out of cells as part of routine maintainance. Extended the life significantly. FWIW you can extend life further by adding phosphoric acid. It also much improves capacity - the downside is it only works over a narrow concentration range, so you need to be up on battery maintenance to derive the full benefit. I have two car batteries. One is completely sealed from external probing. At least I can't se a way of getting into it. The other is one that still has fillers where you can get a hydrometer in. That's the one I want to try and store. The alternative is putting it on trickle charge and hoping it doesn't die before I want to use it You'd get limited life that way, dry storage is indefinite. NT |
dry charge battery
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dry charge battery
Andy Dingley wrote:
You can buy a float charger from Optimate, although everyone I've heard from who has one has also had it kill batteries in a pretty short time. I have a couple of Gunsons chargers, around the same price as Optimate but rather bigger maximum output (around 8 amps). They have a switch to put them into 'permanent float' mode and I use them this way to keep my lawn tractor and my compact tractor batteries healthy through the winter. They've both managed two years so far and the batteries are still happy, the mini-tractor even started OK in the very worst of the recent cold snap after not having been used for several months. So Gunsons chargers with 'permanent float' - recommended. -- Chris Green |
dry charge battery
On Mon, 16 Feb 2009 15:41:50 -0800 (PST), Andy Dingley
wrote: On 16 Feb, 18:17, Alang wrote: On Mon, 16 Feb 2009 10:07:24 -0800 (PST), Andy Dingley Yes, but don't put the contents back into the cells (or mix between cells, but that's old advice anyway). The electrolyte? As long as it's all the same SG it should be ok I would have thought. * Only if it's pure, clean acid. If it's the usual collection of dissolved crud, then it's not a good idea. I was just going to bottle it, flush the cells and seal the battery with tape to keep the air out. I have a pair of 6V batteries for a '30s MG, although I think they're '50s vintage. Three glass cells in a wooden crate. They were drained and stored in the '50s, then when refilled 40 years on they worked fine. I plan to use them again, when I get round to it. That's the idea here The alternative is putting it on trickle charge and hoping it doesn't die before I want to use it Trickle will kill them too - you want float, and ideally temperature compensated. Or else charge intermittently, but regularly. I'd discharge them every now and again. I used truck batteries on alarm systems back in the 60s. They could last 10 years on trickle charging with the occasional discharge test. But I'd prefer dry storage and forget until needed You can buy a float charger from Optimate, although everyone I've heard from who has one has also had it kill batteries in a pretty short time. |
dry charge battery
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dry charge battery
The Natural Philosopher wrote: [...] In stark contrast to those hi-falluting, hi-tek, hi-price Ni/Li types which lose about 5% a day. Gimme a drill fitted with an SLA any day :) NI loses charge fast. LI-ion is amazingly good. Probably takes years to go flat. Oops Ni/cad/'MH' etc Yes. Lithium good. If not then there'd be mobs of villagers with burning torches coming up my path :) Have a test battery in the fridge (6V Lithium DL223A ), still good after 9 years. DL223A |
dry charge battery
Alang wrote:
On Mon, 16 Feb 2009 22:19:58 -0800 (PST), wrote: FWIW you can extend life further by adding phosphoric acid. It also much improves capacity - the downside is it only works over a narrow concentration range, so you need to be up on battery maintenance to derive the full benefit. I'd use it as a last resort but when a battery is dead I'd get a new one Possibly a misunderstanding there. Phosphoric is not a reviver, its something you put in when its new, or reconned. The difference it makes is quite dramatic IMLE with it. NT |
dry charge battery
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Andy Dingley saying something like: Trickle will kill them too - you want float, and ideally temperature compensated. Or else charge intermittently, but regularly. One hour per day on a timer. Keeps mine charged up for years when in standby. |
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