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Helping keep British Motorcycles on the road for over 30 years - established 1977

12N94B-1 Type Sealed 12 Volt Kickstart Battery

Part Number 335-02/A

These modern maintenance free sealed batteries require no filling with electrolyte, and have been custom made to replace the old style batteries. Just make sure it is fully charged, and install - no more vent tubes, electrolyte level checks, or possible acid damage to your classic!

Batteries measure 5-1/2" high; 2-15/16" deep; 5-5/16" wide.
Install Instructions [pdf]


Mark Appleton (Owner, BCS) Comments:

There are many variables that determine battery life once in the field, such as usage patterns, charging system regulated voltage, preparation before installation (we recommend 18 hrs. at ½Amp for these batteries, though 9 hours at 1Amp should be almost as satisfactory). In addition, storage procedure also has a great effect on battery life.

While these batteries are not as expensive as some premium sealed batteries, and consequently, ours could conceivably not have as long an overall life under comparable conditions, we have been selling this type of battery for some time, and this particular brand since May 2008, with only 2 warranties since that date.

Our warranty on all our batteries is a no questions asked free replacement for the first 90 days, then replacement on a prorated basis for the balance of our 24 month warranty, and it appears that that the Powersonic batteries have virtually all been lasting at least 24 months, which is longer than the warranty given by the makers, and most for a much longer time, according to our customers, who have virtually all been very happy with them:

"Power-Sonic Corporation warrants all batteries and chargers to be free from defects in materials and factory workmanship, and agrees to repair or replace any battery or charger that fails to perform as specified within one (1) year after date of shipment (two years for “PG Series\"), two years for PHR Series in non-UPS applications and three years in PHR Series for UPS applications only. This warranty shall not apply if buyer fails to notify Power-Sonic of such defect within ten (10) days after discovery, or if battery or charger has been subjected to misuse, negligence or accident. Application exceptions: batteries used in mobility applications (including but not limited to wheelchair, scooter, pallet jack) shall carry a six (6) month warranty only. This warranty is in lieu of any other warranty, expressed or implied."

Yuasa’s warranty is generally only 6month free replacement. FYI, A few comments raised by Yuasa on their site:

How long should a battery last?

Many factors affect the life of a battery:

CLIMATE - Colder climates tend to be hard on batteries from a starting standpoint, and for the fact that many people put their bikes away for the season when not using. Sometimes without charging properly. Hotter climates tend to discharge batteries quicker, and dry out batteries quicker. "Average" climates are the best for long battery life.

USEAGE - A battery that is used every day has the most chance of living a long life. Batteries that sit a lot, many times are neglected. This shortens overall life. Periodic charging is the best defense.

APPLICATION - How well is the battery charged in the vehicle? Some vehicles have better charging systems than others. Older bikes have worse charging systems than new ones. Are there a lot of extra accessories on your vehicle? Sometimes a battery has a hard time keeping up with additional electrical drains, thus wearing it out quicker.

Negative factors that can affect battery life:

SULFATION - Sulfation is a build up of crystals on the plates of a battery. This comes from not charging a battery properly. The more sulfation that builds up, the harder the battery is to charge, until finally it does not charge at all.

WATER LOSS - Water loss can come from overcharging, or just simple evaporation over time. This only happens with conventional batteries. This does not happen with sealed AGM batteries. Once the plates of a battery are left open to the air, above the fluid level, they can corrode very quickly. Corrosion can cause an internal short, and very quickly destroy the battery. Keeping proper water levels maintained is very important.

LACK OF CHARGING - As mentioned previously, lack of proper charging is the main reason that a battery will not last as long as it should. At the very minimum, a battery should be charged once a month if left unused.

COMPLETE DRAIN - Have you ever left your key on, and totally killed the battery? If recovered in a short time period, the battery should charge back to 100%. But every time this happens, it is similar to the battery having a "heart attack", and shortening its overall life. Always turn your vehicle off with the keyed ignition switch, not the "kill switch".

The Good News:

SEALED AGM BATTERIES - Such as British Cycle's #332-02/A, last longer than other types. They are not "open to the air" by way of a vent tube. They do not lose water. They are also packed tighter. Plates do not vibrate causing material to shed from the plates and short out. Or worse yet, simply breaking apart in some high vibration applications. Sealed AGM batteries typically last 3 to 5 years on average. 6 to 8 years is easily obtainable with proper maintenance.

Typically sealed AGM batteries will give warning before completely dying. They will start slower, and require more charging. This is your clue to replace the battery. Typically they do not fail all of a sudden. Conventional "acid-filled" batteries have a harder life, for many of the reasons listed above. Conventional batteries typically only last 2 to 3 years on average. Although, 4 to 5 years is possible, in the best environments, and with excellent maintenance.