A medical device includes a rechargeable lithium-ion battery for providing power to the medical device. The lithium-ion battery includes a positive electrode comprising a current collector and an active material comprising a material selected from the group consisting of LiCoO.sub.2, LiMn.sub.2O.sub.4, LiNi.sub.xCo.sub.yNi.sub.(1-x-y)O.sub.2, LiAl.sub.xCo.sub.yNi.sub.(1-x-y)O.sub.2, LiTi.sub.xCo.sub.yNi.sub.(1-x-y)O.sub.2, and combinations thereof. The lithium-ion battery also includes a negative electrode having a current collector and an active material including a lithium titanate material. The current collector of the negative electrode includes a material selected from the group consisting of aluminum, titanium, and silver. The battery is configured for cycling to near-zero-voltage conditions without a substantial loss of battery capacity.