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Model Forum / Radio Controlled / Air Models / January 2004charging sealed lead acid batteries safely
Sorry if this has been posted before on this newsgroup, but is it safe to charge a sealed lead acid battery (eg:12V 7Ah sealed) with a conventional 12 V domestic car battery charger, or would it be better for me to use my Super Nova charger from another well charged 12V car battery. I am worried that the car charger may charge at too high a current for a sealed battery. Although these batteries are described as sealed are they actually vented. Thanks in advance Chris. It is ok so long as you put a 21 watt tail light bulb in the circuit. It will glow brightly at first and as the charge is absorbed by the battery and the resistance builds , the light will slowly extinguish. I use this with a 3-5 amp Car battery charger (Gunson 5) > Sorry if this has been posted before on this newsgroup, but is it safe to > charge a sealed lead acid battery (eg:12V 7Ah sealed) with a conventional 12 [quoted text clipped - 6 lines] > > Chris. > Sorry if this has been posted before on this newsgroup, but is it safe to > charge a sealed lead acid battery (eg:12V 7Ah sealed) with a conventional 12 [quoted text clipped - 4 lines] > Although these batteries are described as sealed are they actually vented. > Thanks in advance No problem with a normal charger. > > Sorry if this has been posted before on this newsgroup, but is it safe to > > charge a sealed lead acid battery (eg:12V 7Ah sealed) with a conventional [quoted text clipped - 8 lines] > > > No problem with a normal charger. Probably but be careful. Taillight bulb in the circuit sounds like a good idea. I use a full size charger in parallel across an old half-knackered 12v gel cell when charging my 3Ah NiMhs, which works fine, although left connected the gel cell will get pretty hot within about 3 hours, from which i'd deduct that a car battery charger may work but is probably not very kind to 7Ah cells Most cells have the charging requirements printed on them. Many car chargers will grossly overcharge these smaller batteries. If you are unsure as to proper charging, visit Red's Battery Clinic web site for the proper information. > > > Sorry if this has been posted before on this newsgroup, but is it safe > to [quoted text clipped - 18 lines] > i'd deduct that a car battery charger may work but is probably not very kind > to 7Ah cells Require CVC charger with max charge rate of 600 mAH to prevent venting of cell or permanent separation of electrolyte from plates. best seen were the Ace CVC SLA battery chargers for 6 & 12V. were available as a kit or RTU. A very simple fully regulated at constant 13.6V in circuit is available to use with 16V transformers from slot car sets such as AFX and Tyco - leave on permanently or check whether you can simple plug in with the charger of your home security system's SLA. refer to = http://homepages.ihug.co.nz/~atong/ "Battery care, Chargers & Power Supply." regards Alan T. Alan's Hobby, Model & RC Links http://homepages.ihug.co.nz/~atong/ ............................................................. > Sorry if this has been posted before on this newsgroup, but is it safe to > charge a sealed lead acid battery (eg:12V 7Ah sealed) with a conventional 12 [quoted text clipped - 6 lines] > > Chris. I use a standard DC wall wart at 14.5v. It will charge at 500mA max and the charge rate drops to about 50mA when the battery is fully charged. > Require CVC charger with max charge rate of 600 mAH to prevent venting of > cell or permanent separation of electrolyte from plates. [quoted text clipped - 24 lines] > > > > Chris. I use one of these... http://www.ctek.se/index_GB.htm The best spent money ever, it charges everything between lawnmowers, ATV's and motorcycles to mobilehomes and trolling boat batterys around here.. Since we have a lot of stuff to charge (and yet only one charger) we put pigtails on each battery, so we can connect it without hazzle to any of them. On the Harley and one of the Suzuki´s the batterys are relatively easy to get to, but on the custom Suzuki, it is a PITA, on the mobilhome it is also kind of squeezed in, so those pigtails with connectors are worth their weight in gold (and that's almost the prize of them too, one is included with the charger though) There is also an optional pigtail that you plug in to the lighter output on whatever you are charging, it doesnt work for me, since the lighter doesnt work with the key off... I would have made my own pigtails cheap, if it wasn't for the fact that I got a bunch for free... I am however going to buy another charger, the trolling boat is on constant trickle all summer... Btw, I am in no way connected to CTEK, other then as a buyer of their products, but after this post, I should be head of PR.. Thank you all for your help Regards Chris |
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