Very knowledgeable BMW folks here. It is possible for such a battery to begin to have accelerated failing in hot weather if you leave the dealership quickly. 08/12/2015 and 08/28/2015:   Due to confusion, added more information & strict advice on Lithium batteries. Sometimes the screw post, which is usable on your Airhead, is cheaper. Ted Porter's BeemerShop offers exceptional quality replacement, accessory & classic replica parts. You report to a List or Forum that this is a lousy brand of battery. There are good reasons BMW selected a certain battery size (in ampere-hours) for your bike; many factors were considered. Many problems from folks doing this; including the occasional $$ damage from reversed polarity connections. Initially, the deposited sulfate crystals are what are referred-to as 'soft'. You could have APM ...Absorbed Paper Mat, or many other things, but fiberglass mats are very common. The Panasonic brand of battery is very well made internally. Regarding load testing of the battery, voltage drop while cranking, etc. BMW Motorcycle Airhead steel brake pedal R65 R65LS … 11/26/2005:  Update entire article. Whenever any type of lead-acid battery is at less than full-charge, there are chemical reactions going on that are causing faster deterioration than if the battery was sitting there, fully charged. Coat the entire positive (+) terminal, and + wires metal ends, after assembly; ...and, if the insulation is poor, force some into the wire/insulation junction. A rating of ~0.25 to 2 amperes is plenty good enough. 4. If you do not use a formal Load Tester, the following is a quickie way of doing load-testing, and it is a "sort-of-adequate" method: It just so happens that the typical Airhead starter motor current drain, with a good starter, on a mild day, is going to average approximately 60-100 amperes during cranking; but considerably more when first starting the rotation of the engine; especially if the engine is cold, perhaps from an overnight storage. Make sure there is a fuse in the + lead of the socket. Somewhat modified versions of these batteries were later made for engine starting and became very popular. Snowbum had bikes that wer not driven more than once every month or even three months. Very knowledgeable BMW guy. With sealed batteries you won't be looking for bubbles, but you will be monitoring the terminal voltage. It is used with a flexible plastic or rubber tube that directs fumes down to the ground, typically near the forward side area of the rear tire. BMW airhead starter cover for R45 R65 R80 R100 cafe racers bobbers and trackers. Add to Cart Tray for BMW Airhead models designed to fit the small Shorai batteries. Have the cell caps in place when playing with the charger or other wiring! When the voltage reaches about 14 to 14.5, reduce the charging current to 100 to 150 ma (0.1 to 0.15 ampere), for several days ...checking the current now and then, and adjusting the source if needed to maintain the proper current. However, just how to deal with these voltages is not clear when you see them in the literature ...as the voltage during actual practical charging, is not that voltage. 8.7 or 8.8 volts or higher at 0°F. 04/13/2005:  Note, on Advanced, possibly raising prices. R65 Bmw … This is especially critical during anytime the time the cell caps are off, so be sure the cell covers were replaced before using any charger. Watch the wording in the advertisements. Classic 1971 BMW R75/5 I'm selling a very nice R75/5 airhead, large gas tank model. 05/03/2005:  Remove all information on company, due to non-responsiveness. There are types of batteries that are not normally considered 'flooded' types, that you do add liquid to ...but just once. The result is a cycle of gas>>>water>>>gas. You must measure the voltage at the battery terminals themselves. You will need a new battery immediately, $$$$. If you have a 28 ampere-hour battery, that means 2.8 maximum amperes. Consider very carefully how your battery will be used, and under what conditions, etc. Sand down the unthreaded part of the plastic hold-down knobs threaded hole area. You may be able to 'rejuvenate' it good enough to last a considerable period of time. There is a top bracket with two plastic nuts with wave washers that secure the battery in the box. This type of battery often fails in cold weather rather early; & in some instances can fail in mild weather. Filling the battery with acid mixture and initializing the battery is best done by my method, which is better than what the battery maker usually says. You are also unlikely to find one of that size that will fit into your bike. The distance from the bottom of the battery box to the underside of the tool tray is not always the same. Crank the engine for 10 to 15 measured seconds. 4. The conventional flooded battery, with or without 'sealed battery chemistry', must be charged regularly, or kept on a maintenance charger. Turn the stock metal-type battery hold-down upside down. The AGM/VRLA batteries have very low internal electrical self-discharge and are usually shipped from the manufacturer fully charged, and probably will be OK on a dealers shelf for 6 months or so, unless the dealership battery storage area is quite warm. Saved by ALEX BROWN. NEW BATTERY FITS BMW R60 R65 R75 R80 R90 R100 MOTORCYCLES REPLACES 52515 53030. BMW has sold a battery they called a Gel type, which may be equal to the Panasonic in life expectancy, provided it is "properly taken care of", which really applies to all batteries. A load testing done while watching the RATE of voltage lowering adds a LOT of information, and, while unknown, I will explain that, etc. WestCo stopped selling rebranded Panasonic batteries long ago, as far as I know. We speak Airhead! In many instances, these abused batteries, rejuvenated some, will draw a lot of charging current (which causes heat, and faster deterioration), and have other characteristics, that cause additional wear on your alternator charging system. 14. A valve vented lithium battery is also a VRLA, strictly speaking. The hydrogen gas given off by flooded batteries (or, gross overcharging of other types) can cause an explosion from such as a spark from a battery charger connection. Consider what the situation would be if you had a regular lead-acid battery, rated at 28 AH ...and changed it to a 6 AH. The battery has no side vent nor hose; fumes are released upwards from cell cap holes. If the terminals are backwards, you 'make' it work in your bike, putting stress on the battery terminals, etc. The liquid level will probably be OK for a very long time. You have to add water occasionally to flooded batteries that have removable cell covers. The charger should be at least 6 ampere rating, but not over 20. 02/28/2018:  Minor fixes to spacing, underlines, layout...mostly appearance things. The LiFePO4 (ONLY!) Another popular brand is the Enersys-Odyssey, sold as a premium product. Some have used 'Garden tools' batteries. I strongly advise you not put a new battery of any kind into service until you properly charge it fully. INTRODUCING THE ORIGINAL BMW BATTERY PRICE FINDER. Nitpicking aside ...the CCA test is real world useful. If your battery is drained very considerably, or is dead, and your Smart Charger does not begin to charge that battery, you have no choice but to use some other type of charger on that battery (or jumper to another battery for a few seconds), until the battery terminal voltage rises enough for the Smart Charger to then be connected, recognize the battery, and turn itself on. If over .35 volt difference (headlight on) you may want to check the fairing voltmeter calibration, & if OK, then check for resistance at various contacts, relays, & connections, beginning with the ignition switch. Antimony is another substance often used in these batteries. If it works, it typically works for a rather short time period. This "extremely long term trickle charging" is, as noted, done at 0.04 to 0.06 ampere. The voltage regulator should not be hot from a previously run engine for this test, unless you use a lower voltage for that temperature. . 2. Sagging more than 0.4 or 0.5 volt means a battery has aged considerably. If your battery charger is still delivering 3 or more amperes & the terminal voltage of the battery is already over 14.2, then you want to be cautious about using that charger, and certainly not allow the voltage to get too high. Rejuvenating. which are shipped without acid; you fill it; then you seal the battery ...although there is an over-pressure vent. These batteries have a very flat voltage discharge curve. If you remove the battery from the bike, or at least disconnect it (disconnecting all wires to the negative terminal will do), then there is no problem with using a de-sulfating mode charger on any bike. If the battery is a flooded type, be sure to check the fluid level occasionally (do not forget ...I have mine on my calendar). Tom Cutter's Rubber Chicken Racing Garage: Tom likes the MotoBatt batteries, & stocks and sells those. Battery Relocation Kit. Apart from the BMW R65 , BMW R80 , BMW R100 , BMW K100 and BMW K75 , other models from the brand include the F, S, G and C series, even with a scooter version for the latter. Back to lead-acid batteries: $13.99 Battery Housing for Pre-1955 BMW Twins & Singles 6 Volt. The stator was redesigned with a center tap for the three windings (which fed to the diode board) and the rotor winding resistance was decreased to 3.4 ohms. You're likely to get loads of opinions on this. That should, ideally, leave plenty for some idling time, then you can ride down the highway & hopefully the ride is long enough at a decent RPM to replenish the battery. This is not to be done with lithium batteries. 12/26/2014:   Minor tech changes. De-sulfation chargers do work 'sort-of', at least sometimes, but if the battery charge was quite low for any goodly period of time, de-sulfation modes, if they work at all, will be unlikely to give much more battery life, compared to you using a standard charger, or a smart charger without de-sulfation protocols, in trying to resurrect the battery. The 2-meters Harbor Freight unit is semi-automatic ...and has fully and continuously adjustable load settings and a bell to tell you when the time is up; just quickly dial up the test level of current, then watch and let the unit do the automatic testing. It is important that gas bubbles be eliminated now & then during the initialization period & a full & complete soaking of the internal parts accomplished before any high current charging. I have eliminated my previous lengthy specific recommendations on where to buy specific batteries and what models... due to being unable to keep up with changes. You have no rain clothes, no tent, no sleeping bag. They are hardly the only ones with a good reputation. Short wheelbase Airheads, K11 with ABS2, R1100/1150/1200C, K1200 brick and R1200RT. While that can be OK, you want to be cautious about wear, fires, etc. If the battery is older, never had acid in it before, the cell top sealing was removed or never there in the first place, & the battery is stored in an area that has goodly temperature changes during the day/night, & higher humidity ....all these things will conspire to reduce battery life, even once it does have acid mixture put into it. Contrary to popular belief, AGM/VRLA batteries do not like, not at all, being heavily discharged & then sitting that way for any period of time. You will need to use a small lamp or resistor, etc., to get the current that low. Since the battery does not fit correctly, you return to the store with the battery & find that batteries are covered not by exchange for a correct one (if they have such! So, my present second-best is to fill to highest level line or even a bit more, with distilled water (if a flooded type that can have water added); then connect a cheap non-smart wal-wort low current charger to it, with a series resistor to limit the current flow to 0.060 ampere, as measured after a full charge ...and keep it in relatively cool place. Some have an SAE type polarized two-wire connector fastened semi-permanently to the battery. Afterwards float-maintenance charge can be in the 13.8 v. area. Do your own research on the Internet. My preference is for round, not hexagon, metal mounts ...due to possible interferences. Be sure to check the small starter relay pass-through internal connections under the fuel tank, as all current flow to the system except the actual main starter motor power, flows through that relay's internal connections ...and, its socket connections; BMW uses red wires on those connections. These batteries also have another peculiarity...on a cold day, a heavy loading will heat the battery plates more than a flooded battery, and so give a bit better performance after a few starting attempts, due to the increased chemical activity in the mats and plates. The amount of time necessary to charge a battery, considering chemical inefficiencies, can be as long as, but not necessarily is, in hours, the rating of the battery divided by the average charging rate, plus as much as 50%. Donating? For the Classic K bike the VR is part of the brushes assembly inside the alternator, & can be changed to the higher voltage version with some effort, as you must remove the alternator and disassemble it. BMW airhead battery side cover R100T. As your vehicle’s battery ages, surprises are the last thing you want. Some of the sellers do not mention that if the battery is well-discharged, a sudden fast charging will destroy the battery; or, at least reduce greatly its otherwise expected life. Unless it is an emergency, never, ever, jump start a bike with a highly discharged lithium battery. So, make sure you never let the battery become discharged to or below 10.0 volts. Another way of thinking about Peukerts, is that a huge electrical load on a lithium battery, and to some extent a AGM battery ...will not effectively reduce the total ampere-hours capacity nearly as much as it would on a flooded battery, because the Peukerts value is less for the Lithium/AGM/GEL/VRLA, compared to the flooded type. The battery begins to deteriorate from the moment of acid mixture installation. For those that want to do it this way, it is simple. That voltage will rise very slowly, and then much faster rising will occur. The VR in K bikes is internal to the alternator, so you can't check its temperature by feel ...but the alternator case is good enough. If the knobs are not sanded, & just put in upside down, that sometimes works, but if you also put the stock hold-down upside down, that may make it less easy for your fingers to rotate the plastic knobs. However, you really should be knowledgeable about how the test is done, and what the readings or interpretations mean. Westco AGM Sealed Battery, 12V/30AH For K75/100 2 Valve Bikes Up To 9/92 & /6 & /7 Airheads Plus All R100R Models $129.95; Westco 12V30 AGM Battery/Battery Charger Kit $199.95; Accumate Automatic 12V/6V Battery Charger $58.95; Accumate Automatic 12V/6V Battery Charger/BMW Plug Adaptor Kit $69.95; Accumate BMW Plug Adaptor Cable $14.50 You will likely find that a Lithium-Iron-Phosphate battery of even half the true AH rating of the common Airhead-sizes of lead-acid batteries is very pricey! What happens in battery use, particularly charging (something similar, in reverse, can happen under heavy drain) is that oxygen is formed at the positive (+) plate, and the oxygen reduces or eliminates the normally otherwise produced hydrogen at the negative (-) plate. This will probably result in a longer battery life, and only quite slightly less life for your incandescent lamps, which will be a wee bit brighter while going down the road. The exact point at which you stop the charging is not critical. Then, use a real battery load tester to analyze the battery's condition. You get to go back to the motel, and pay for another night. I prefer initialization of a new battery using a common type of non-smart charger, if you monitor the temperature and voltage of the battery. DIN sockets and DIN work well & don't have the failure of common American type cigarette sockets/plugs of disconnecting or making poor contact. Which battery to purchase:  Lead-acid AGM? Lithium batteries are different from lead-acid batteries in this respect ...a lead-acid battery can be fully discharged, even to zero volts, & if not heavily discharged for too long a period of time, is likely recoverable; this is especially so for old-fashioned flooded batteries. 09/16/2016:  Update metacodes, scripts, layout, content improvements for clarity. Allow a long time for the charging and rejuvenation. Some of the newer lithium chargers (see the manufacturer of your proposed battery, such as Shorai) have fully-controlled chargers now available ...I had been expecting that to happen. BMW sells the gray gel battery for this. The truck driver takes her to the bus station at her request. If you are the type of person who does take care of your battery, you can possibly get as much as 50% longer life than my averages, but you probably will only get 20% additional life. It runs well and has had a LOT of work done recently. DURING the cranking, also watch the voltage. $15.00. I recommend you use an accurate digital voltmeter at the battery terminals to compare to the load tester's analog meter, for more accurate information. Sticker "Bosch" for Battery Case. BMW airhead r60 r75 r90 k1100 Rubber Battery Mount NOS BM46. Panasonic Battery: Rejuvenating lithium batteries electrically, assuming the battery is very heavily discharged: A special charger is almost a must for some of you. Since the cells of all batteries you will be using on your engine-powered motorcycles and cars, are in series connection, variation between the cells will cause an unbalance in voltage on any particular cell....and the moreso, the harder it is on the battery. FYI:  "Authorities" VR's are usually set to about 14.4. The advantage of this sealed and dry-shipped battery, is that it has a VERY long shelf life, so long as the seals remain UNbroken. If the battery is rated in "lead equivalent", this is another wishy-washy half-assed way of specifying the battery. There were also truly bad quality AGM batteries sold, and this perpetuated the rumors about AGM. If you have a flooded battery, do check the water level every two months, no matter what type of charger. Some, on purpose, try to cleverly avoid information such as Cold Cranking Amperes (CCA) by using other terms that are of no importance, or even meaningless. A very sophisticated type of battery tester that measures conductance/impedance is available, these testers are hundreds to thousands of dollars. More current, more gassing bubbles. ...no! CCA, combined with what is called Reserve Capacity, is what is important, besides quality and fit. I suggest you re-read this paragraph. Free shipping . There are exceptions. After the re-labeling was abandoned, the WestCo battery was probably a relabeled "BB" brand. You purchase what you think is the best of the best, and pay $$$$ for a Lithium battery supposedly designed for motorcycle use. What it means on a practical simplified basis is that some batteries can be discharged (there is a re-charge effect too) at a higher % of capacity rate than others, with a minimal or less loss of total capacity. FlatRacer BMW Airhead & K series battery tray kits. 01/01/2020:  Clean-up discussion about lithium batteries to improve ease of understanding. Not all will do this. No drilling, grinding or welding necessary, absolute “plug & play” installation. The difference is primarily in the plate chemistry (typically a calcium component) ...I will get into this a bit next. 40+ years experience. CCA is how many continuous amperes the battery will supply for 30 seconds at 0°F ...before the battery voltage falls to 7.2; where its energy level is essentially zero. The storage or available capacity of that lithium battery (6 AH being assumed here), assuming no other large drains than just to start the engine, and means that you could crank, for a bit of time, each, quite a number of times ...allowing the starter to cool off between starting attempts (the way you really should use a starter). It is a small, but measurable, effect. These chargers are generally OK for use if the battery has ...perhaps ...a quarter charge ...or more. You could even use an old small light bulb for the resistor. If a LiFePO4 battery is discharged enough, it can be seriously damaged. For riders that commute in cities with stop and go traffic such that the electrical system does not keep the battery charged, and you want to connect a battery charger every night, you really should have a Smart Charger, with an easy to connect setup. Adjust the Harbor Freight unit's meter (slotted screw on the face of the meter) so it reads the same as the digital meter. Suffixes are AP and P; both will work in an Airhead. Still a messy article. If it does not reach 13.7 minimum; 14.5 maximum (although 14.9 is OK at quite cold temperatures) as the rpm gets higher & higher (might take 4000 rpm depending on the lights, etc. Small spot heating can injure an area considerably. 03/04/2005:  Update entire article to reflect latest information and include all prior revisions, greatly expand information. If properly taken care of, both the Panasonic and the Odyssey, brands often talked about, are usually very good batteries; but, like ANY type of battery, one should pay attention to charging voltage/current & avoid excessive discharge for any period of time. When the voltage reaches the fully charged amount, turn the charger off. You might be interested in what settings are practical and useful for the three major battery types; and, a few other things. Another way, to use the non-smart inexpensive type of charger ...is to add a series resistor or proper lamp used as a series resistor, in the charger battery lead (either lead, + or -, will do) so that the long-term charging does not exceed 0.060 ampere. You do not want a metal hold-down to electrically short the  terminals, so I made my hold-down straps to go across the approximate middle, so this was never a problem.
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