Lenovo ThinkSystem DE Series Manual page 17

Steps
1. Unpack the new battery, and set it on a flat, static-free surface.
To comply with IATA safely regulations, replacement batteries are shipped

with a state of charge (SoC) of 30 percent or less. When you reapply power,
keep in mind that write caching will not resume until the replacement battery
is fully charged and it has completed its initial learn cycle.
2. Orient the controller canister so that the slot for the battery faces toward you.
3. Insert the battery into the controller canister at a slight downward angle.
You must insert the metal flange at the front of the battery into the slot on the bottom of the
controller canister and slide the top of the battery beneath the small alignment pin on the left
side of the canister.
4. Move the battery latch up to secure the battery.
When the latch clicks into place, the bottom of the latch hooks into a metal slot on the chassis.
(1) Battery release latch
(2) Battery
5. Turn the controller canister over to confirm that the battery is installed correctly.
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