Per DGR 54 Edition 184.108.40.206 (valid until 12/31/2013) Portable Medical Electronic Devices such as AEDs which contain lithium batteries (not more than 8g lithium contents for lithium-metal and not more than 160Wh for lithium-ion batteries) may be carried as checked baggage. There is no quantity limits per passenger however 10 units would be bulky and not suitable for cabin storage. I would recommend these be accepted as checked baggage and stored in the cargo compartment. As for spare batteries, up to two spare batteries are permitted per passenger but must be in carry-on cabin baggage. All these batteries must have been tested per UN Manual of Tests & Criteria, Part III, subsection 38.3.
Effective from 1/1/2014, the 55 Edition comes into force. Lithium batteries must have been tested under UN Manual of Tests & Criteria, Fifth Revised Edition, Part III, Subsection 38.3. Batteries tested per Fourth Revised Edition can no longer be transported after 1/1/2014..
Furthermore, with the 55 Edition, Portable Medical Electronic Devices in 220.127.116.11 will be relocated to 18.104.22.168 in the group of Carry-on Baggage only. Effective 1/1/2014, AEDs will be allowed only for carry-on baggage. They cannot be in checked baggage.
For Medical devices dealt in DGR 22.214.171.124 (lithium contents not more than 2g; lithium-ion not more than 100Wh) may continue to be accepted as checked baggage.