How to charge a maintenance-free Bosch s4 battery

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Causes of malfunctions

In addition to long storage of the battery, one of the main causes of battery malfunction is the so-called complete discharge. This phenomenon is characterized by instantaneous and complete depletion of battery capacity.

Damage to a battery left in this condition can have very serious consequences, and the more serious the consequences are the longer the downtime of the car.

The consequences: loss of power, impossibility of recharging, considerable reduction of battery life.

How to charge a Bosch car battery

As with all products of the German group Bosch, batteries are reliable, technologically advanced and of high quality. Bosch batteries must be charged with great care to avoid overheating the electrolyte.

If the battery is flat, remove it and try recharging it in a warm place. Find out in advance what capacity the Bosch battery has, which is printed on the battery housing.

If it has a conventional design with acidic electrolyte, then when charging, set the charger to a current that is no more than one-tenth of the battery’s capacity. For example, if you want to charge a 65 amp-hour battery, adjust the charging current on the charger to no more than 6.5 amps.

Make sure it does not overheat. Remove the battery covers. If the electrolyte boils in it, the battery can be permanently damaged. 10 hours must elapse before the battery is fully recharged.

How to find out the date of manufacture and decipher the code

The marking is printed on the battery cover and consists of a set of numbers and letters. How to determine the year of manufacture from it? The first character, a letter, represents the country of manufacture.

Edited: This is discussed in detail in a separate article, read here.

The date of manufacture is encoded in the following numbers. The fourth digit is the last digit of the year of manufacture. The fifth and sixth are the encoded month of manufacture. 17. January, 18. February, 19. March, 20. April, 53. May, 54. June, 55. July, 56. August, 57. September, 58. October, 59. November, 60. December.

Did you have or have you got a Bosch battery?? Then tell me in the Комментарии и мнения владельцев about your impressions of it, it will greatly help other motorists and make the material more complete and accurate.

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Charge time calculation

If you work with automatic chargers, you don’t have to calculate anything. The unit will shut itself off when it has run out of charge.

But motorists are potentially interested in knowing how long it will take to charge. This is based on how much capacity the battery has lost.

Let’s assume that the voltage has dropped to 12.1 V. This corresponds to a 50% charge. Since a 50 Ah battery needs to be charged for 10 hours at 5 amps per hour, then it would only take 5 hours to compensate for 50% of the capacity.

Is it possible to measure the density in a maintenance free battery?

Theoretically you can do a lot, but practically, unfortunately, not. The same is true for maintenance-free batteries.

Their design is very similar to that of conventional batteries, except that their plugs are either hidden or sealed (we are talking about batteries in n.1.).

Theoretically you could pick it all up and take it off and then measure the tightness, but in this case you would lose the seal, which you would not be able to restore.

Therefore this way of measuring the density in maintenance free batteries is contraindicated and this is the main disadvantage of these devices.

In this case, you will only have to rely on a hydrometer, if you have one, or a voltage gauge.

How to charge a maintenance free (calcium) battery

First let’s understand which batteries are maintenance free? All batteries are divided into Serviceable, Low Maintenance and Maintenance Free. The following brands of popular batteries are maintenance free: Tubor, Titan, Akom, Bravo, Cobat, Vaiper, Forse, Tyumen Bear Ca/Ca and 99% of imported batteries. What is a maintenance free battery??

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Many motorists and sellers in auto stores think that the maintenance-free battery is the battery that does not have plugs for access to the electrolyte, but this is a misconception. A maintenance free battery is a battery that, over its lifetime, does not require topping up with distilled water. All calcium batteries are maintenance free, i.e.к. The alloying (making strong) of lead with calcium significantly increases the threshold for the electrolyte to begin to decompose into oxygen and hydrogen (hydrolysis), which reduces the boiling off of water to a minimum. In calcium batteries hydrolysis begins at voltages over 15 volts.

All calcium batteries are divided into batteries with access to the jars (Tubor, Titan, Tyumen Bear Ca/Ca, etc.).) and without access to the banks (Varta, Bosch, etc.).). Access to the jars is needed to measure the density of the electrolyte and refill the electrolyte in case it leaks.

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Myths about maintenance free batteries

Avid car enthusiasts are “afraid” of maintenance free batteries

it’s like a car without a hood that opens

Before you charge a maintenance-free car battery, it is useful to familiarize yourself with myths and misconceptions about them. Ideally it should help to avoid fatal errors in operation. And for some motorists the considered information will be a valid reason to refuse buying the maintenance-free accumulator. As well as on the contrary. someone will want such battery even more, or will be even happier with the already bought one.

Зарядка необслуживаемого аккумулятора / Charging a maintenance-free battery

  • A maintenance-free battery is absolutely maintenance-free. Maintenance of the car battery is not only about manipulations with the electrolyte. As a minimum, if necessary it should be recharged from a stationary charger (master class for recharging the battery before the winter with the photo report). And ideally one should also pay attention to the cleanliness of the case. It is useful to clean terminals from oxides and salts too (there is a detailed material about oxidation of battery terminals at Auto without a service station). In general, it’s not that maintenance-free.
  • Maintenance free batteries are a conspiracy. There is a conspiracy belief that manufacturers have removed access to the electrolyte for reasons other than convenience and safety. And to make the battery die faster. If you are inclined to believe in such a thing, you’d better refuse to buy a maintenance free battery right away. From the rest of the advances in scientific and technological progress. too. Just in case. What if it’s all a conspiracy?
  • The plugs of the maintenance free batteries are there, but they are hidden. One of the branches of conspiracy in the world of batteries. If you shine a light on some maintenance free batteries, you can see something that looks a lot like a cork. But if to disassemble such a battery, then “the plugs hidden by clever manufacturers” will turn out to be nothing else but the moves of the system of gas circulation and pressure balancing.
  • Without vandalism it’s impossible to know the level of electrolyte in the maintenance free battery. You can do it at ! Sometimes in two ways at once. Number one, there are maintenance free batteries with an indicator. The second. the electrolyte and its level can be seen through the light.
  • Maintenance-free batteries are not afraid of tilting and flipping. Gel and AGM batteries really have no fear. And as for the models with electrolyte in bulk. you can’t tilt or turn them upside down. In their manuals it is usually written. But who reads them.
  • Charging a maintenance free battery can cause an explosion, as there are no plugs that can be unscrewed. In order to release excessive pressure while charging the maintenance-free battery, there is a special system of channels and valves in it. And sometimes they inflate not from the pressure of gases, but from overheating and deformation of the lead plates.
  • To replenish level of lost electrolyte in maintenance free battery is possible through control indicator. In one of the six compartments, you really can. If it is possible to remove this very indicator. It is not possible to fill up the remaining five “jars” this way. They are separated by partitions.
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These are not all myths. But the task was to consider those that relate to the question of charging maintenance-free batteries.

Removing and installing the battery

Installation of Bosch Silver Plus s5 is performed in strict accordance with the instruction manual issued by the manufacturer and the technical passport of the car. Experimenting with installation can end badly, not only for the car and the battery, but also for the motorist, since this process is classified as a high-risk job. Algorithm of Action:

  • Turn off the engine and all electrical equipment before installing or removing the battery.
  • Install only batteries that are fully charged, undamaged and recommended for the particular vehicle.
  • Avoid short circuits, use only approved tools and cables.
  • After installation in the vehicle, remove the cover from the terminal blocks.
  • Disconnect the negative terminal (-) and then the positive terminal
  • Before installing, clean the inside of the vehicle.
  • Secure the battery firmly and safely. If poorly installed, it will be subjected to vibration, which reduces the service life. Friction between the battery container and the placement surface will damage the case, then the electrolyte will begin to leak.
  • Clean battery terminals and lugs. Lightly coat them with anhydrous grease.
  • Connect the positive terminal when installing
  • When removing attach first. negative lead (-).
  • Check that the terminal lugs are firmly fastened.
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