Battery Charger Nitecore UM4 — 4‑slot charger for LiFePO4 / Li‑ion / Ni‑MH / Ni‑Cd, supports AA AAA AAAA C D, 9V DC input, black

The Nitecore UM4 is a compact 4‑slot battery charger designed for household and general‑purpose charging of multiple cell chemistries. It supports LiFePO4, Li‑ion, Ni‑MH and Ni‑Cd batteries and accommodates AA, AAA, AAAA, C and D sizes. The unit operates from a 9V DC input and provides a 4.35V output suitable for the supported chemistries, offering a small, black charger that can manage up to four cells simultaneously.

Advantages

The charger accepts multiple battery chemistries and common cylindrical sizes, reducing the need for separate chargers. With four independent slots, it allows different batteries to be charged at the same time. Its 9V DC input and compact footprint make it convenient for home use and storage, while the black finish provides a neutral, unobtrusive appearance. The design focuses on practical, multi‑chemistry compatibility and straightforward operation.

Suitable for

• Home charging of AA, AAA and other supported rechargeable cells
• Maintaining spare batteries for household devices such as remotes, toys and flashlights
• Charging mixed battery sizes and chemistries simultaneously
• Small workshop or hobby setups where compact multi‑slot charging is needed

Key specifications

• Number of cells supported simultaneously: 4
• Supported chemistries: LiFePO4, Li‑ion, Ni‑MH, Ni‑Cd
• Compatible sizes: AA, AAA, AAAA, C, D
• Input: 9V DC
• Output voltage: 4.35V
• Product colour: Black

How to use

Insert batteries into the slots observing polarity markings on the charger and on the cells. Connect a suitable 9V DC power supply to the charger’s input before beginning charging. The charger can be left to charge up to four batteries at once; monitor charging progress according to the charger’s indicators and disconnect when charging is complete. Use cells that match the supported chemistries and sizes specified for safe operation.

Usage recommendations

Use a manufacturer‑recommended 9V DC adapter and place the charger on a non‑flammable, level surface during use. Avoid charging damaged or swollen cells and separate battery types only when they comply with the supported chemistries and sizes listed. Store the charger in a dry environment when not in use.