I have 6 8volt batteries that are dead. My charger won‘t charge them b...
 If the 8 volt charger won‘t do it, try using a 6 volt charger to bring them up to the point where the 8 volt charger can ‘read them’ and turn on - See more at: https://www.batterystuff.com/kb/frequently-asked-questions/powersports-batteries-faq/12-volt-battery-reading-13-volts.html#sthash.Gh2PtkHk.dpuf
Why is My 12 Volt Battery Reading as 13 Volts?
 All Lead acid batteries (Gel, AGM, Flooded, Drycell, etc) are made up of a series of 2.2 volt cells that are bridged together in series to reach their final desired voltage. For instance, a 6 volt battery will have 3 cells (3 x2.2= 6.6 volts), a 12 volt battery will have 6 cells (6 x2.2=13.2 volts) and so on.That 2.2 volts is the fully charged, straight off the charger number. The actual resting voltage, or the voltage a battery will settle at 12-24 hours after being removed from the charger, is closer to 2.1 volts per cell, or about 6.4 volts for a 6v battery, and 12.7 volts for a 12v battery. These numbers assume 100% healthy cells, and may vary a bit lower for older batteries. - See more at: https://www.batterystuff.com/kb/frequently-asked-questions/powersports-batteries-faq/12-volt-battery-reading-13-volts.html#sthash.Gh2PtkHk.dpuf
How to Recover a Fully Discharged Lead Acid Battery?
  Lead-acid batteries need to be kept charged otherwise the cells can be permanently damaged. If you have a fully discharged lead-acid battery, the best way to recover it is to charge it very slowly using a "trickle" charge. This lets the individual cells recover and means the battery retains its charge. If you charge a fully discharged lead-acid battery quickly it's likely to lose its charge. Check the battery cell caps for removal. If the caps come off, verify fluid level inside the battery.
1. Wear protective gloves. Lead-acid battery cells contain sulfuric acid which burns if it gets on your skin.
2. Place the fully discharged lead-acid battery on a battery tray or flat piece of wood. Remove the six cell caps on the top of the battery. Unscrew them using your fingers or pry them off using a flat-head screwdriver. Do this carefully as the cells contain sulfuric acid. Some batteries are sealed units. Do not attempt to access the cells if they are sealed.
3. Check the fluid level. Note the mark in each cell. The fluid should be up to the mark. If the cells require more fluid, top them using distilled water. Ensure the water covers the cells completely. Replace the caps.
4. Get your battery charger and place it near the battery. Set the battery charger to its lowest charge rate. Some have pre-set settings, others have a variable switch. It may also have a setting called "trickle charge." This is the lowest setting and is perfect for charging a discharged battery.
5. Connect the black cable from the battery charger to the negative terminal of the battery using the spring clamp on the end of the cable. Connect the red cable from the battery charger to the positive terminal on the battery. Both terminals are clearly labeled.
6. Plug in your battery charger then turn it on. Check the battery charger to ensure its charging the battery. The dial indicates the charge rate, or a light illuminates.
7. Let the battery charge for 24 to 36 hours. Turn off the charger and remove the cables from the battery.
8. Check the output voltage of the battery using a voltmeter. Touch the red and black wires from the voltmeter on the positive and negative terminal of the battery. If the voltmeter reads 12-volts, the battery should be charged.
9. Leave the battery for a day or two. Check the output voltage using a voltmeter. If it reads between 11- and 12-volts your fully discharged lead-acid battery is recovered. If the voltmeter reads less than 11-volts the battery is losing its charge. The lower the voltage, the more damaged the battery.
How to Remove Sulfation from Lead Acid Batteries?
  Sulfation is a natural chemical process that takes place, if lead-acid battery plates are exposed to air, or the specific gravity goes below 1.225. Sulfation occurs when soft lead sulfate, which is a combination of lead and sulfur, cystalizes into hard lead sulphate. It results in the battery cells being unable to retain an electrical charge so the battery goes dead. If the sulfation is too advanced, then you can't remove it from the lead plates, but if it has only just started to occur, you can remove it by gently recharging the cells.
1.Check the fluid level in the lead-acid battery cells. Remove the cell covers by unscrewing them with your fingers or a flat-head screwdriver.
2. Check if the fluid level is below the minimum marker on the side of the cell. You can probably see the lead plates are exposed. Sulfation is apparent when you can see hard lumps of crystals on the plates and around the cell walls. Provided the cystalization isn't covering the walls, and the plates only have small deposits, you may be able to remove sulfation during a slow recharge.
3. Fill the lead-acid battery cells up to the maximum marker using distilled water. Leave the cell covers off. You will heat the plates during the recharge process, which will help dissolve the sulfation.
4. Connect the two battery-cable clamps from the battery charger to the lead-acid battery terminals. The red cable connects to the "+" terminal and the black cable to the "-" terminal.
5. Set your battery charger to the lowest rate of charge. The slower and longer you charge your lead-acid battery the more likely it is that the sulfation will be removed.
6. Turn on your battery charger. Charge your lead-acid battery for 6 hours then take a look inside the battery cells. Don't turn off your charger. If you see tiny bubbles rising to the surface in each cell, that is a good sign and means your battery cells are charging. The charging process starts to dissolve the sulfation. If you can't see bubbles rising in a particular cell, it may mean the cell cannot recharge, but wait until the full charge time is complete.
7. Continue charging the battery for at least another 18 hours. Look in the cells again, but don't turn off the charger. The cells should be producing rapid bubbles, if they are taking a charge. If any of the cells is not producing bubbles by this time, the cell can't recover. You will need to purchase a replacement battery.
8. Feel the side of the battery using your hand. It will feel warm, which is good. The heat and the bubbles are removing the sulfation on the lead plates.
9. Leave your battery to charge for another 6 hours. Turn off the charger. Remove the charger's battery-cable clamps from the battery terminals. Replace the covers on the cells.
World Voltage and Standard AC Plug for Battery Charger
  US Plug


UK Plug

AU Plug
Typical Charge process curve for 3-stages Sealed Lead Acid battery cha...
  When charging an empty SLA or AGM, GEL, VRLA battery,the charger output a constant current (C.C.), the battery voltage will increase slowly, when this voltage reaches 14.8V (For 12V battery)  or N*14.8V ("N" means the serial number of 12V SLA battery), it's also called " equalizing charging" or "CVh". At this stage, the battery voltage is limited at N*14.8V and the charging current will declined slowly. When the charging current drop to 0.03C level, the battery will be full charged, the charger will change the CV. value from n14.8V to n13.8V, this stage also called "Floating charging" stage. One variation is to start a timer at "CVh" stage, when the timmer out, the charger will enter "Floating charging stage" automatically. 
This curve is a real record for a standard 3 stages charging process, based on A100-24 charger.
Typical Charge process curve for 3-stages Sealed Lead Acid SLA battery charger
(blue-Voltage, white-Current, green-Temperature)
What is Lithium polymer batteries?
  Lithium polymer batteries, also known as LiPo batters, are rechargeable electrochemical cells popular among radio control hobbyists and utilized in numerous other applications, such as small-scale robotics and wireless consumer products. LiPo batteries are lightweight and versatile.
Rechargeable lithium polymer batteries were first manufactured for wide scale consumer use by Sony Corp. of Tokyo in the early 1990s. They were seen as an alternative to the unstable, highly reactive and potentially dangerous lithium metals commonly found in batteries up to that time. The energy density and average operating voltage of LiPo batteries are today up to three times that of nickel-cadmium batteries.
LiPo Chemistry
As in all batteries, energy is produced in lithium polymer batteries through an electrochemical reaction contained within the battery cell. These batteries represent an improvement in conventional battery chemistry due to their increased energy output and low recharge time.
Advantages and Limitations
LiPo batteries produce twice the energy, weigh half as much and hold a full charge longer than nickel cadmium batteries. Longevity is a drawback, though, because their life span tends to be only about four years.
Common Uses
LiPo batteries are commonly found in remote control vehicles, cell phones and cordless phones. Other applications include notebook computers, mp3 players and PDAs. Researchers are currently studying the potential use of lithium polymer batteries in automobiles and other modes of transportation.
LiPo batteries can be extremely dangerous if used improperly. They have caused fires in homes and automobiles after erupting during charging or after impact. They are also extremely sensitive to high temperatures and must be properly stored to avoid spontaneous combustion. They should be stored in fireproof containers when not in use, and not left unattended when charging.
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