XTAR VC4 Battery Charger
https://owlsense.odoo.com/shop/xtar-vc4-battery-charger-36
https://owlsense.odoo.com/web/image/product.template/36/image_1920?unique=67be334
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An easy to use 4 bay charger. Charges 4 cells in about 7 hours.
Requires a 2 amp USB input.