BMW Boxer 2-Valve Battery boxes and batteries

Our battery boxes for the BMW Boxer 2-Ventiler are made of high-quality stainless steel and are available in natural as well as black powder-coated. The battery boxes fit all our rear conversions, but also the original BMW 2V rears. In addition to the normal versions, which are installed below the seat in the rear frame, we also offer a battery box that is mounted under the gearbox. It is important to know that for the installation of the "under engine battery box" no exhaust pipe may run under the gearbox. This is the case with all our 2-2 exhaust systems for BMW two-valve engines. 

We use a lithium-ion battery with a capacity of 4Ah in all our conversions with consistently very good experience. The lithium-ion batteries are able to use almost 100% of their capacity, while the lead-acid batteries, due to the specific characteristics, only 30%. Consequently, the Ah value cannot be compared 1 to 1.

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For vehicles with higher compression, extensive electrical equipment or vehicles that are often used in the cold season, we recommend the use of 5 Ah or 6 Ah LI batteries. The cold is also still a condition in which the lithium-ion batteries lose power. If a bike is standing in a cold garage during the winter, you will feel loss of power during starter operation. If a motorcycle stands in the warm, even with long breaks in operation, the engines start as if the battery had been charged shortly before. In general, battery fresheners or chargers with low charging currents are still a good measure during longer breaks.
We install the lithium-ion batteries, without any further modifications, in the old bikes, i.e. also in all our BMW Boxer 2-valve models. The prerequisite is, of course, that the charging system is in order. What the LI batteries do not tolerate at all are too high charging currents above 14.5 volts. Such high voltages can occur with a defect of the charge controller or by charging with unsuitable chargers that work with fast charging or pulse currents.