Hello Raphael02
We have the Bosch Professional AL 36V-20 charger on the one hand and the Bosch AL 3640CV on the other.
The Bosch Li-Ion 36V 6.0Ah battery fits both of these chargers.
We have the Bosch Rotak 43 LI lawn mower.
Kind regards
R.C.F.

I have an older green Bosch battery 36 V with 2.6 Ah. This fits the Bosch Rotak 37 li lawn mower. And the new red Bosch battery 36 V with 6 Ah has exactly the same dimensions. Unfortunately, I no longer have the Rotak 37li here with me. But as I see it, the new red 36 V battery with 6 Ah fits perfectly.
I use this new battery in a Honda lawn mower (they have the same batteries).

Quick charger for Bosch battery packs. Singlevolt chargers 36 V Li-Ion, charging current: 4 A, charging time 50 min. The AL 3640 CV charger for all 36 V Li-Ion battery packs from Bosch. The current of 4 A for a 6 A battery is lower, but it simply takes twice as long to charge. However, the external dimensions of the 6 A battery are larger than the 4 A and therefore it does not fit into the slot of the Bosch 37 Li, which is designed for a maximum of 4 A.