Batteries

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Batteries for Arduino, Raspberry Pi, and maker projects Single-cell alkaline (AA, AAA, 9V), Li-ion 18650, LiPo packs, coin cells, and battery holders. Stocked locally in Metro Manila — same-day shipping for orders before 4 PM weekdays. Pick the right chemistry for your build: alkaline for low-current sensors and clocks, LiPo for portable robots and wearables, 18650 for high-current draws like motor drivers, coin cells for tiny embedded boards. How to choose Voltage: match the board's input range. Arduino UNO accepts 6–20 V via VIN (7–12 V recommended). ESP32 dev boards usually want 5 V via USB or a 3.3 V regulated supply. Current: motors, LEDs, and Wi-Fi modules can spike to hundreds of mA. Pick a cell with discharge rating (C-rate or mA) above your peak load. Capacity (mAh): runtime = capacity ÷ average current. A 2000 mAh pack powering a 100 mA load runs ~20 hours. Rechargeable vs disposable: Li-ion / LiPo / NiMH save cost long-term; alkaline is fine for one-off builds or low-drain clocks. Form factor: coin cell (CR2032) for thin boards, AA holders for breadboard projects, 18650 for high-current rigs, LiPo for wearables. Common chemistries Alkaline (AA / AAA / 9V): 1.5 V per cell (9 V for PP3). Cheap, shelf-stable, single-use. Best for sensors, clocks, low-drain wearables. Lithium-ion 18650: 3.7 V nominal, 2000–3500 mAh typical. Rechargeable, high discharge current. Best for motors, robots, power banks. LiPo (single-cell pouches): 3.7 V nominal, 100–5000 mAh. Flat, light, common in drones and wearables. Needs a protection circuit + balanced charger. Coin cell (CR2032): 3 V, ~225 mAh. RTC backup, BLE tags, small sensors. NiMH (rechargeable AA / AAA): 1.2 V per cell. Drop-in replacement for alkaline in many holders. FAQ Which battery for Arduino projects? A 9V PP3 with a barrel-jack adapter works for short demos. For longer runtime, 4×AA in a holder (6 V) or a single Li-ion 18650 (3.7 V) through a boost / regulator is more practical. How do I power an ESP32 from a b