#18650

The customer's old case is only 130×370, so I measured three times before I dared to cut anything. 13S6P, 0.2 nickel-plated strip, UF20B at gear 38 — watching the welds light up one by one is seriously addictive. Halfway through, the welding pens touched and blew a hole right through one cell. Swapped it out and started over — newbies, remember this: position first, then press. Don't rush. BMS goes in tomorrow, it goes back to the customer the day after. Will report back.

54 × 18650, 3S18P, 12.6V 36Ah. The inverter does 600W continuous, 1200W peak. The moment I plugged in the rice cooker my heart was racing — rock solid! Welded with the P60F, double-layer nickel strip in one pass, not a single cold weld. It took two evenings; the hardest part wasn't the welding, it was cramming this pile of modules into the storage box and still leaving room for airflow. The video shows the whole process. If you want to build one, follow along, and ask questions in the comments.

Three 18650s plus an e-bike headlight, with a water pipe for the housing. Welded the nickel strip with the H1 — tiny little thing, handles 0.12 strip with zero effort. Switched it on outside at night and the neighbors thought someone had left their car headlights on. Hahahaha. Pic 2 shows the internal wiring, for anyone who wants to copy my homework.

7.4V battery for a small fan, two 18650s in series, but after welding it only reads 3.7V. Did I put the nickel strip in the wrong place? I'll add pics tomorrow, just asking first whether this is a common mistake... feeling a bit down.

18650 in 3S8P, U3 Pro at gear 55, 0.15 nickel-plated strip. I'd watched a dozen-plus tutorials and still didn't dare start. Once I actually did it, it wasn't that scary, and the welds are stronger than I expected. The moment the light came on at the campsite — totally worth it. Thanks to everyone in the comments who taught me.