... can be up to 17%,20 years life,5 years guarantee.2. maintenance-free lead-acid battery,over charge & discharge protection.with high quality ... -plated steel pole and coating to color of your choice, ss fasteners, 20 years life, 10 years guarantee.7. work temperature: -30 ... 65.10. height: 6m~12m, solar and wind street light of high quality illumination