I bought a pack from GMBattery, 48V 14Ah NiMH. Rocky, who handled my account, answered my endless questions promptly and accurately. The pack was built exactly according to my specifications. They even built a plastic box to contain the cells. It was done within a week and I received it about four days later. I am pleased with the cost and the service, in case you want to try them out.
Guangzhou Markyn Battery
E_mail:sales5 [at] gmbattery.com
rocky [at] gmbattery.net
MSN: sales5 [at] gmbattery.com