Right... Lets see... The 25C you mention is the discharge rate only, not the charge rate. Unless specified, the charge rate of a LiPo battery is maximum 1C, meaning that for these batteries is 0.15A. In theory, you can overcome this by using a serial/parallel setup woth 6 batteries making one big 2S3P, but in practice it's not something I would recommend, as the decay rate might differ in some of the cells, causing them to charge differently, and exceeding the 1C rate. If you knew enough about electronics, you could probably calculate an inline resistor to install inside the unit to lower the amperage... But the only real safe way would be to get an Imax B6 type charger with which you could charge them all at 0.1A
You can try the series-parallel setup if you want, but as I said, you would need 6 batteries, all the same, same age and similar number of cycles each.
Gracias por el saludo, excepto que en mi caso seria "bienvenida" ^.^