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Note: the battery must be in parallel rather than in series. One bad battery will affect the whole group battery. Recognize the positive and negative. To avoid damaging the motherboard, exposed part of the wiring must be wraped well.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.