SAFETY:Using High magnification Brand and New battery,using the latest technology,can prevent overcharging,discharging and overheating,safe and durable,no memory effect,fully compatible with the original battery pack. TRUST WORTHY RELIABILITY:no memory effect, low self-discharge rate (1% per month). Patented battery balance technology, built-in over-protection circuit to provide safe and reliable use technology to protect your use. Fit MAK Tools: 3700D, 3700DW, 4071D, 4073D, 4307D, 4307DW, 4770D, 6002D, 6002DW, 6002DWK, 6010D, 6010DL, 6010DW, 6010DWK, 6012D, 6012DL, 6012DW, 6012DWK, 6015DWE, 6015DWK, 6016DW, 6017DWBE, 6017DWE, 6018D, 6018DWBE, 6018DWE, 6019D, 6019DW, 6019DWBE, 6019DWE, 6019DWLE, 6022DW, 6071DW, 6071DWK, 6072DL, 6072DW, 6072DWK, 6073D, 6073DW, 6075D, 6075DW, 6172D. PERFORMANCE:Using A-class batteries,non-previous generation batteries,under the same capacity,the running time is stronger and more durable Guarantee:Reject fake labels,strictly follow the capacity label production,up to 12 months warranty,1 month worry-free refund.