Walmart offers the iRecharge Universal Rechargeable Notebook Battery, model no. RPCX, for $4.88. Shipping adds $1.97, or choose free Site-to-Store. Even with shipping, that’s a $3 drop and the lowest total price we could find. Sales tax is added where applicable. This lithium-ion rechargeable battery provides up to four extra hours of operating time and is compatible with brands such as Dell, IBM, Apple, Sony, HP, and more.

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