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Cherryl, You could try local stores that sell computers and electronics, Walmart, the source, staples etc. Check the attached links,for power pack/charger, Good luck
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Sounds like a battery problem.
Lead acid batteries should to be charged every 3 or 4 months even if they are not being used, or they can slowly self-discharge and will start to deteriorate if the voltage drops below about 12.2v (for a 12v batt.)
They can then be difficult or impossible to charge. The charger can see this as fully charged and show green.
You can test for this if you have a voltmeter. You should be able to work out if it's the battery or a connection (or the charger).
Measure the battery voltage (use a DC voltage range greater than 12V). The normal voltages you should see:
A) Key off, no charger: >12v, <14
B) Key off, charger connected: >12, <14.2, but higher than A)
C) Key on, no charger: >12, <14, but lower than A)
If voltage A) is low and immediately goes high when the charger is connected then the battery needs replacing.
If A) and B) are exactly the same then it could be the charger is not connecting or is faulty. Measure the charger output, should be >13.8v (unless it's an "intelligent" charger in which case it might need some voltage applied to its output before it starts charging).
Note: If A) and B) are low, say <8v it's possible that an "intelligent" charger will refuse to start charging. In this case it's probably worth jumping the battery to a good 12v battery (e.g. car). Be very careful to connect the batteries (+) to (+) and (-) to (-). Leave connected for 10 - 20min or even overnight and then disconnect jumper leads and check A) and B) again. Sometimes a battery can be recovered by this method (it's unlikely to regain full capacity though).
Product Detail Model No.: HB-1206S The item is used for charging 6V-12V lead-acid batteries Max Charging Current: 6A AC Power Input: 64W Output: 6/12V DC 3. 52A Batteries Capacities: 15AHR-80AHR Unit Packing: Colorful box Dimension: 18cm x 10cm x 20cm G. W. / N. W.: 1. 85KG/1. 75KG Certifications: GS, CE, BS, ROHS, SAA
Main functions: (1) The HB-1206S battery charger has the features of convenient operations, reliable safety and high performance. (2) During charging, if turn up overload, the battery charger will keep itself at normal current and normal voltage with its self-automatic protecting function. (3) If being short circuit, the battery charger will switch off itself, and turn normal after one or two minutes. (4) The output current of the battery charger is very stationary, so it can protect the battery charger very well. It only costs 3 or 4 hours to fully charge the batteries. (5) Indication of charging: the battery charger has 6 pilot lamps. The more pilot lamps shining, the less electric quantity is. The charging process finishes when all the pilot lamps go out. (6) The battery charger can be switched between 6V and 12V, so it can charge for 6V and 12V accumulators. You can select 6V or 12V according to your own needs. (7)The operations are very convenient: Put the red clip to the positive pole of the accumulator which indicated "+", and put the black clip to the negative pole of the accumulator which indicated "-", then plug in power source, the accumulator will be charged.
I really don't have any idea as to what you're talking about here other than a battery and maybe a charger. Seems as if you're saying that you have a 12 volt 1.5 amp automatic battery charger connected to a 12 volt, 8.5amph battery but the red light on your charger is blinking. The blinking red light indicates that the charger is not seeing a proper connection such as crossed polarity connection or simply a poor connection. You say that the battery voltage has dropped from 12.5 volts to 9.1 volts with the charger connected. If this is the case, the battery is badly discharged and the charger is not charging the battery for some reason. The charger may be bad but check the connections to make certain they are correct and good. If they are, I'd replace the charger.
before you dump those batteries, check the charger. If the battery when charged runs the tool but dies out quickly then you are probably right. If the battery never seems to be charged at all, then it may be the charger.
About the only indication if the charger is not working is when you put the batteries into the charger and no lights come on. This indicated that the charger is faulty. If the lights come on it is most likely the batteries. The best thing to do is take the batteries and charger to a Bosch service center and they will test them for you. Most will do this for free.
You are charging. The meter corresponds to the level of charge in the battery. Try setting to 10 A for 4 hours, battery should be half-way up. To determine if battery id dead.. leave battery off charger once it is fully charged...test with a voltmeter after 10 min.....battery should still be above 12v...after1 hour it should still be above 12v...if not battery is spent.