452e0d97_HAL_0_5_14_Specification__Description
[Key (type)] battery.technology (string) [Values] lead-acid, lithium-ion, lithium-polymer, nickel-metal-hydride, unknown [Mandatory] No [Description] 
The technology of the battery processed to a few standard types. This key is needed as the hardware often does not specify the description text for a battery, and so we have to calculate it from the output of battery.reporting.technology.
HAL 0.5.14 Specification
Description